[blykins]

Any machine shop that does balancing should be able to do this no problem....The guy that assembled the engine should be able to do it.

Your engine builder probably has acceleration in mind....the others you were referring to probably had economy and low rpms at speed in mind. This will just come down to your preference. I'm running a 3.70 9" Ford with a 4-speed Toploader.

You should be fine with the C4, especially if this is just a street car. You need to grab your cam specs (mainly duration) and maybe someone on here can help match a stall converter to your cam. I've never ran an auto.....I just know enough to be dangerous.