need to raise compression w/o new pistons

Here is the senario: My buddy scored a brand new rebuilt never been fired up 71 360 motor complete for $400. The guy had it rebuilt to stone stock specs and everything is new and showed us reciepts for all of it to a total of somewhere around $2400. But due to having a baby and cut back at his job he needed cash bad. His loss our gain!
So the problem is that a 71 360 motor w/ flattop pistons only has a compression ratio of 8.7 (probably closer to 8.0 really). He wants me to figure out a way to raise the compression as much as possible without replacing the pistons (doesn't want to re balance the motor again) My machinist is on vacation so I can't ask him about this.
What I need to know is, if we have the block zero decked and mill the heads to the safe maximum, does anyone know what we would end up with? Also what is the average cut needed on the block? What is the safe max cut on the heads? What is the stock cc on the heads (J heads)? I also figure on using a .029 head gasket and re camming as necccessary even possibly fly cut the pistons if need be.

edit

I found this burried in the archives on my site but I don't think it is accurate ...plug in your numbers and tell me what you think about its accuracy

http://moparsa2z.com/web/archive/auto%20converters/Engine%20Compression%20Ratio%20(CR)%20Calculator.htm