Mike,
Everything will swap from the 350 to the 400 exept the cranskaft (different balance but same stroke) and the the pistons. Look closely at the flywheels. There was a different regsiter bore (the big hole in the middle) Vs. the early and late cranks. The flywheels interchange other than this fact. You will know when you have the right one because the other one will not slide onto the crankshaft.
Early heads had one less accesory bolt hole, but other than that, all the brackets will interchange.
Once you have dated the 400 and post the head casting codes (numbers are on the center exhaust outlets) we will all have a better idea of what parts you will need to get a pump-gas friendly compression ratio.
For what you describe, a basically stock rebuild, with emphasis on cleanliness and good quality parts, including a mild camshaft, should give you more than enough power to have fun with in a street cruiser.
Welcome to the forum!!!...Robert
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