Nice calculations.
I like to use bore x stroke to get a little more accuracy instead of 360/8.
DartVader:
If you want to know the true compression for your components, you can check it with the info in this thread on how to check your compression. It's a basic, cheap, easy way to check your parts. This procedure eliminates part stack up and variation and tells you exactly where your parts are:
http://www.forabodiesonly.com/mopar/showthread.php?t=278215
