Well I tried the spark table from an 89 vette on my car and it seems to be way too advanced. As soon as I put a load on it it started to knock(as seen on scanner) and pull a whole lot of timing(my 02 was in the 800). If its true that a better combustion chamber shape needs less timing, should I just take 5 degrees out across the board and start from there.
By the way Im running AFR 190 heads(68cc)with 10:1 compression. I would think that these heads have a much better combustion chamber design compared to an eighties vette head.

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355 10:1 , AFR 190 heads, LT4 HOT cam w/ 1.6 roller rockers, complete Superram intake, 58mm BBK TB, 24# injectors, screens out of MAF, MAT relocated, March underdrive pulleys, Streetdampner, Crane HI-6 ignition, 160 thermostat, K&Ns, TES headers(Jet hot coated), Mufflex 4' cat back, B&M shift Kit, 2500 converter, and 3.27s.

 

I would think that you should pull 5 or more degrees of timing and then sneak up on the values that give the best performance.

Least advance, best power. You might find that you can run more or less timing and have the same performance. Less is more in this situation.