340X heads
I put on a set of MP 360 high swirl heads with the 2.02 intakes. Muscle Motors told me it "should be OK but no sure bet. So far 700 miles and no problems.
I milled my heads .030 to 63cc chambers, my 1979 318 heads had 69cc chambers. My cranking compression went from 130 psi to 160 psi.
Motor seems to run better at all speeds, I am happy. Now those newer 360 heads have a bit smaller intake ports, not sure how the X heads would have been.