What BVR said...
FWIW, that 6 is a 250 Chevy engine. The bellhousing on the TH350 (are you certain it's a 350 and not a 250?) is the same as your small block.
Please refer to the small block as a Chevy, and not a "GM". In today's new car "world", there are ONLY "corporate" engines. In olden times, each division had their own unique engines. You will find, the Pontiac V8 is a good one, and readily available. For a street-performance engine, the Pontiac is FAR superior to the 350 Chevy. For an all-out "race" engine, the Chevy has a slight edge due to race parts availability. It's no "giant killer", though. A 400 Pontiac, built to the same level of tune as a 400 small block, in a car as heavy as your LeMans, would blow the doors off the little Chevy. Big blocks are a different story...
Most importantly, build the car to suit yourself. We only offer advice. If you bought a "crater", let us know which one, and we can advise on how to make it perform as well as they advertise.
Jim
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