Not as Hipo as it sounds. What's up?

krazykuda said

I think that you should look into the compression issue. I put 360 heads on a 318 that had 10.5 compression and it brought it down to 9.2. They will bring a 273 down more since it has smaller cylinders. So whaever your compression is with stock heads, it will bring it down about 1.5 in compression if no milling was done.

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Possibly / probably more in this case, as the 273 should have closed chamber heads, and the 360s are open and huge in comparison. If it were mine, I'd get a set of 87-91 318 heads from a junkyard, clean em up, swap the valvesprings for those on your 360 heads, and toss em on. Can't run any worse, and I am certain it will run better, despite the loss of high RPM breathing. If you are on a budget, have stock gears and convertor, and must choose between compression and breathing, ALWAYS choose compression.