My present cam:
GM Part Number (stock in 305tpi 5spd and 350 auto's for 88 and 89.)10066049

Lift: IN.415 Ex.430

Duration: IN.207 Ex.213 117.0

Separation: 117.0

R.arm ratio: 116/-118

What I'm looking at:
Duration @ .050

206 / 212

Lift (with stock 1.5 rockers)

.480 / .487

Intake Centerline 112

Much higher lift but less on the duration side (very little).

let me know what kind of power I can expect out of this cam swap. This is an SLP Comp cam.

The 1 degree of difference is hardly going to make up the fact that the LSA is lower and it will generate more power. The added lift will add a lot more power as well. I definitely wouldn't worry about that 1 degree.

Any guestimates on power increase? 25hp?

I'd go with a Compcams XR264HR in your car.

http://www.compcams.com/catalog/058_059.html

I just found out that the cam I'm looking at is an SLP 51002 cam. (make by comp I guess).
I can get it for around $100 US new...

Also, I noticed they have two versions of the XR264HR. One has 112 seperation and one with 110. I've read a few place that TPI likes the 112 better for a cleaner idle (no lop)which I really want.

Stock lob seperation is 117 on my cam according to thirdgen.org's cam chart.

Do you think this cam would be too much for a 305, how much power can I expect from the XR264HR and would i pass emissions?

Hawk took the words right out of my mouth! The XR264HR-12 is the biggest cam you could go with, without having to do several more mods. I would still get Comp springs to match that cam. Computer tuning isn't necessary with that cam, but even that wont hurt to do also.

With PROM tuned perfect for it and some nice valve springs, you could expect 25 - 35 hp at the flywheel increase over the stock peanut cam and stock PROM calibration.

Make sure you get the one with the 112 LSA.

It's a decent cam!

If that was the increase over my non-peanut cammed 5spd 305tpi, then I'd go for it. I think I'm gonna hold out and wait for the 350...

Better choice! Drop in a 350 with an even bigger cam!