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Most of the late 60's 2bbl 350 Lemans came with a 10-bolt 2.73 non-posi gear but almost anything was available so you have to check as Arch describes above. The 2.73 is a good highway gear but limits take-off power. For spirited but still highway-worthy driving I like a 3.23 gear for a stick or 3.55 gear for auto. Anything higher than this is best kept off the highway except for short drives.
The rear ends used on the Pontiacs (BOP) were different than used on Chevys and the parts do not interchange. But gears should still be easy to find if you want to make a change. Limited slip rear-ends were not uncommon but the original clutch packs are usually worn out and when I tried to have one rebuilt 10 years ago I found replacement parts were impossible to find. But maybe this has changed.
Putting a 4bbl manifold and carb on a stock 350 will give an immediate power boost, as will installing dual exhaust. Just about all of the engine parts including the heads will interchange with the 400 so you can go nuts and still keep the 350 block.
My '69 conv came with the 4bbl 350, turbo 400 and a 3.55 gear but this was very unusual. The 350 will not make quite as much power as a 400 but they are very durable, run cooler and put less strain on the starter motor which are definite benefits. I actually dirt-track raced LeMans bodies with Pontiac 350's years back and was quite successful. I would never consider trying this with a Pontiac 400 engine.
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06 Impulse blue, M6, 17"
69 LeMans Sport conv, red with all the options
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