Come up with a plan that will make the car as reliable as possible. Putting an old richmond behind a big block pontiac probably isn't a wise choice. When I put my foot on the floor I want to feel confident that I'm not going to scatter a tranny, rear end, drivshaft, etc. So.....
What is your intended purpose for the car?
How much power do you plan to generate?
What rear gear ratio will you be running?
What highway speeds do you frequent?
I would plan on a blow proof bellhousing and a tko 600 or t56 magnum for the power you should generate out of a 455 Pontiac. Otherwise, you will eventually be on the side of the road scratching your head and wishing you put a tranny behind it that was meant to hold up to the torture. If you are a car show guy that putts around, then you can get away with almost anything.
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Todd
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