X heads on a 273??

I've run 72 340 1.88 intake J heads on a 273 on the street. No problem with torque. Used offset dowels to center the chambers on the bores, 10.5 TRW .040 over, .040 off the heads, no bore notch. Stock 71 340 intake, cam, and carb. It did have a 4 speed and an 11 inch scalloped clutch to hold it. Easy and quick 7k redline. Breathtaking acceleration. Maybe i'll have time to put it back together someday. 2.02 would probably need the notches and I'd mock it up and double check everything.