Swap pistons for quench?
Even 4 advanced the dynamic compression is only 7.5 and estimated cranking pressure of 145.
If you use the Wallace Dynamic compression calculator, it has the advantage of spitting out a V/P index, by which you can compare sub 3000 to 3500 rpm power. What it attempts to do is deliver number by which you can compare not just before and after changes, but compare your engine to any other sized engine. Thus it gets eye-opening in a hurry.
For instance, I have, in my head the V/P numbers for most of the Mopar small blocks. a 5.2 is 124, a 360 is also about 124, a 318LA is 118, a 225 slanty is 87 and a 273 is I forget around 98 I think. a 68 440 magnum IIRC is 145. So if your engine comes in under 100 well that is 273 territory, and you don't want your 360 to run down there, cuz below say 3200, it's gonna feel like a 273. but if you can coax your 360 up to 135, well it's getting spunky. By 145 it's feeling like that 440 Magnum...... below 3200.
Numbers above 150 are for frying tires.
Mine has run up to a tic over 170, but is currently at ~156
The V/P numbers are just numbers, until your engine pegs the tach for 7 or 8 seconds in the Eighth.
http://www.wallaceracing.com/dynamic-cr.php