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The good news.......lots of parts are available!
The bad news, they were really gutless engines....150HP (gross or net), leaving almost 100 hp to the rear wheels...smog heads, etc....a good engine to start with and just plan on cam/head changes, etc.
The MII 302 is a "Ford 90 degree" or "Windsor" style motor. No C motors in MIIs. Last year for the C, which was a 351C, is 1974. 302C motors are Australia only. Who would waste a Boss 302 in a MII unless there were a lot more done to it--and it wouldn't end up in the scrap yard methinks....
255 was issued 1980-82. Never in MII's, and no one in their right mind would have transplanted one. The clue to a 255 is an open runner intake manifold with a valley pan, like a Y block.
The 255 is to be avoided. Crank is weak, heads are poor, nothing really good about it.
As for getting too detailed, well, paying attention to details is how you come home with a 302 and not a 255, or a 351C instead of a 351M. I could go on & on.....
Best of luck All American. I am casually interested in finding some motor parts for my next motor and have my eye out for a 255. You might have to do the same, put together one from a good 302 short block.
As said before to lower capacity for class restrictions, fuel economy etc. Usually get more revs out out of them too so if built properly they can go well. BUT smaller engines are for smaller cars (within reason). Capacity usually has torque (from bigger cranks, longer rods and such) and that is what it takes to get bigger vehicles moving
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