If I mill .050 off the head and use a .027 thick gasket (the thinnest I can find) that should put me around 11 to one compression but I will have .032 quench. I calculate that the milling .050 results in 10.5cc reduction in the chamber. converting the 10.5 cc is equal .6407 cubic inches. I could deshroud the valves, recheck the CC's and maybe mill a small pocket if necessary on top of the piston to bring the compression area back to what it was before milling. the deck of the head looks thick enough to take .050 off.

I would do the .050 mill and set your quench with the gasket at .040 to be safe and help with lowering the comp. Could also deshroud the valves for a little more if needed. But beware, if you shave .050 and your decks already been shaved you will need to shave the intake side as well as you will have some intake fitment issues to deal with. Common stuff though.

What can are you running? 11:1 should run pretty easy on pump gas with .032" quench

11 to one with iron heads a pump gas?

Yeah with a decent sized cam, tight quench, and a 4" bore that shouldn't be a problem. Like I said... I have personally ran a 12.2:1 motor with .030~.035": quench on pump gas. This was with a 248@.050 .600" roller cam.

Thats good to know. I haven't really picked a cam yet. I am leaning toward one about that size. I am also gonna run a 4 speed. Should be fun in a 69 Dart

You'll have to be a little more careful with the stick...if you lug it hard enough at low RPM you'll detonate it.