which is faster.
IIRC, in '73 a 360 wouldn't have come in any performance applications...mostly trucks (can anyone verify?)...
If you're comparing hp numbers, keep in mind that ratings switched to Net HP in '73, making the numbers apples and orages.
If I had to guess, eliminating all other variables, the '73 360 would be much better since it had similar compression, similar heads, more cubes.