I've been looking for a while now and I've never seen any timing tables produced for their performer heads.

These are the heads [Link]

I have these on my 90 Suburban with their MPFI intake + mild cam.

I'm sure edelbrock came up with timing for these when they where designed. I just haven't been able to find any data.

Has anyone seen any data and can point me in that direction?

This is the timing I've been using for a while.. I get a few counts of knock that I never hear in the 1800-2000 band. Base timing is 0.

 

How to determine the best timing is something that I have also struggled with. And I suspect I am much further off than you are. Here is my setup. Note the quench, the cranking compression pressure, and static compression ratio. These three things make it very hard to compare different setups, but the same heads:
355 chevy
Edlebrock 60859 heads
0.037" piston to head clearance (quench)
200 psi cranking compression (on the edge too much)
static compression ratio 10.5
old tpis zz9 cam (need 'bigger' to drop cranking compression)
Edelbrock MPFI manifold (TBI conversion intake)
stock exhaust manifolds and cat
similar to stock cold air intake tube
no EGR
3.08 rear ratio / 700R4 / 1991 stepside std cab chevy truck
EBL port mod computer
initial timing 3.87 (call it 4). Did run 8 but that wasn't good for hot starting.
No surprise, I have to run premium. Spark counts and retard seem to be somewhat unpredictable. Highway mileage is good (18) but city mileage is bad (12) considering usual city driving doesn't have a lot of red lights or stop and go.
Don't use this Main Spark table, but since no one else replied here it is.

 

Thank you for sharing your table. I'm mostly looking to see if I'm generally in a reasonable area. The suburban probably spends 95% of the time in 10 zones on that map. I rarely get into the other cells so I don't have any data on if I need to pull timing.

Freeway cruising with no traffic gets me about 20-21 mpg without lean mode on (w/ EGR on). City is down around 12.

-Eric

 

I am running Etec 170 heads on my L31 350 Vortec in my Express along with a Comp 215/220 @ .050 cam and my timing map is not that much different than the one Edelbrock made for those Performer Heads. Pulling around a 6,200 lbs Express van turning a 4L80E and 9.5" 14-bolt with 3.73s it runs really nicely. Went to the river this weekend and was cruising back up from San Marcos on I-35 loaded with 6 people, our camping and rafting gear and was cruising with traffic at 2,700-3,100 rpm @ 85-95 mph, blasting the a/c to cool our sunburns and still got 16-17 mpg. I drove 250 miles and used right at 1/2 tank of gas. (31 gallon tank). I do not run EGR and have Thorley Tri-Y headers, high flow cats, and a walker dynomax school bus muffler. Cruising down the road at that speed, when I open the throttle a little the 350 runs so smoothly and quiet you would swear an electric motor was pushing the thing.

This is what I am running for a timing map. I have my CMR set at 6* BTDC (factory spec is like -1 to +2) which allows me to run up to 48* of timing at very light throttle cruise. Some of the LS engines without distributor limitations run up to 52-56* of timing in similar situations.

Idle is around 0.20 gms/cyl and 750 rpm. Off-Idle acceleration at about 30% throttle puts it down about 0.60 gms/cyl and 1,600-2,400 rpm. 60% throttle runs the engine up to about .72 gms/cyl and kicks the shift points up to about 3,500 rpm. WOT the at 1,200 rpm the gms/cyl is about 0.82, increases up to about 0.96-1.02 at peak torque around 3,500 rpm, then falls back to about 0.84 gms/cyl at the 6,200 rpm fuel shut-off. Cruise at 50 mph is around 0.24-0.36 gms/cyl and 1,700 rpm. At 70 mph it turns about 2,400 rpm and about 0.48 gms/cyl. At 85 mph it is spinning about 2,700 rpm and still about 0.48 gms/cyl. When it is in overun, light throttle, going down hill at 85 mph, it can be as low as 0.12 to 0.24 gms/cyl and run as much as 48* of timing.