It is in my 86 Iroc now. From what I can gather those are peanut port heads and likely a stock cam in it.

I did a gtech run with it and it ran a 13.46@105 with an easy launch. Thing is it falls on its face at around 5000rpm so I am all in about half track.

What are the good casting numbers for iron heads?

I suspect a better cam in the .550 lift area combined with better heads would wake it up a bit even with the stock pistons.

I don't want to put much money into it till I can afford to do it up as a forged 496 with good aluminum heads and a solid roller.