Is it a stock V8 or modified? New or Used condition?If its a low horsepower any trans will do but if that v8 has some power you need to choose a little better and that will probably cost more money.
If its a stocker I would recommend a something like a saginaw 3 speed. They are usually pretty weak and people usually dump them for something stronger.
You need to go to a local auto graveyard and see what they have.
One thing that would be a good suggestion is to go out and hit the wreaking yards or watch the papers for a doner vehicle if you have the engine and trany in mind that you want to use and if you want to put a different frontend on that rod