I would recomend staying with a Buick engine. There are a number of sources for performance parts. I prefer the 340 motor. Granted it's a little harder to find certain parts for, but it's a bolt in. Look for an early 350 as another option. The 300, 340, and 350 share a good amount of parts between the three, such as radiator hoses, motor mounts, front timing covers, etc. There are quite a few small block Buicks out there that are pushing good numbers at the track.
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