Is the 383 a better engine, or does the 440 just have more displacement?

33IMP said

Pardon my ignorance. What Is REC90?

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90 octane non-ethanol gas. Rec is abbreviation for recreational, as in boats, ATVs, etc. Good for most anything with a carburetor, as long as the octane is sufficiently high. Works nice in my 340. Higher than 90 is available some places, but not near me. I'm about 2 miles from a Great Lake, so easy to find. I use it in four carbureted engines.
There's a cell phone app called Pure Gas that lists stations offering non-ethanol gas based on your location. It tells you where and what is offered. Pretty handy.