Here is what I put into Dyno 2000.

406 cid
afr 190's 2.05 1.60
10.5:1
single plane
small tube headers open exhaust
750 cfm carb
zz3 cam

My results are almost too good to be true. I get 540 hp at 6000 rpm and 537 ft. lbs. at 4500 rpm.

Do I have the right cam specs?

roller
seat to seat
.474
.510
IVO 23
IVC 72
EVO 73
EVC 27

 

Use the seat to seat,adv. duration and hydraulic flat-tappet.The roller selection is for race only cams and give way to high numbers.

 

That gives me 480 hp at 5500. Is that more accurate?

 

I got 453hp at 5500rpm. I like to use the head flow #s from here http://www.chevyhiperformance.com/techarticles/41598/ all the heads are flowed on the same bench.