I would try to get a quench piston or head combo to kill the detonation , if you get a stepped piston you can have both qurnch & the lower compression
Making use of quench piston and head combo would let you run more compression and still get away with 85-87 cheap gas without detonation. Typically set your quench clearance to 0.035-0.040 inch, but you MUST measure everything, double check yourself and the machine shop work. I do what Smokey Yunick suggests, mock the short block with crank and one piston/rod comb in #! hole. Check clearance at TDC, then put that piston/rod in the other 3 corners and measure TDC there too. Assuming your crank stroke has been checked, you now know how much to deck the block for piston typically flush with top of block for 0.040 head gasket. Then after you get the block back from decking, mock it up again to check the machine shop work. I had one block where the shop foregot to take that last 0.010 off one deck surface, caught the error in the second mock up.
Like Chryco said you will need cylinder head with quench pad built into combustion chamber. Most of the OEM BB mopar heads DO NOT have a quench pad. IF you go aluminum heads you can raise compression typically ONE full point of compression and still run on 85-87 octane pump gas. So now you could build a 10-10.5:1 static compression and run on cheapest pump gas.
Remember, the engines resistance to detonation diminishes somewhat during the first 10,000-20,000 miles, so I have read we should add compression conservatively.
