I just figured everything I could to get my compression before I put my heads on and wanted to make sure its right.
What I have figured:

Bore: 4.00
Stroke: 3.48
Combustion chambers: 56cc
Deck Height: .018 (put at TDC and used feeler gauges to measure at top edge vs deck)
Head gaskets: .047 (9966pt)
Pistons: 5cc (flat top w/ 4 reliefs)

and I used an online calc and came up with 10.638

does that sound right? And it should run fine on pump gas?

 

Should run fine on 93. Not sure about your math, Im no good either tho.

 

Sounds right. I'd use the impala gaskets to squeeze a little more compression out and tighten up your quench. You would then be at 11.2:1. With a good tune, you'll be fine. I am at 12.4:1 on 93.

This site has many calculators:

https://www.camaroz28.com/services/calcs/

 

I was gonna go that route but I picked up this whole gasket set cheap ($50) and since I'm running out of $$ will just go with them, cause I still need to get the tb, pushrods and fluids plus the tune. Not to mention this is a DD pickup (check sig below) that will go to the track every now and then to blister some stangs

 

Still not too late
http://www.superchevyperformance.com...p/12553160.htm

 

it is now