That would be a big block. If you are referring to the diesel engine, it is based on the Oldsmobile rocket block, and shares nothing with the engines usually referred to as big block or small block.
68-72 Oldsmobile big block 455
350 Big block?
That engine number is from a BIG block Oldsmobile engine. Check some links below.
The '65 Vette varied in HP from 300, 350, 365, 375 and the big block at 425. What's amazing is that the 425 HP upgrade only cost $292 more.
The 1965 Chevrolet Corvette came standard with a big block engine. The motor was 396 cubic inches and was able to produce over 425 horsepower. The big block helped pave the way for future American muscle cars.
yes there is the Oldsmobile division released one for 2 years only in 1975 and 76 i currently have one in my 85 Pontiac grand prix
Yes, you didn't say which brand (Pontiac, buick, oldsmobile?) All are different but all have potential.
Big block
It could be if it is a big block but a "long block" means it includes the heads a short block does not.
The 350 engine is a small block, not a big block.
It is a "windsor" (small block) with Cleveland heads (big block).