I can't say which is the best company for you to deal with. There have been many on this board who have stated the good and the bad about various converter builders. You haven't said what engine you're using, MOPAR or GM with the powerglide behind it. Make sure you let the companies you contact, what engine you are using, and if you are using a mid-plate between the engine and trans. Anything can be made.
See what others say about the various companies and then spend some time comparing what these companies are offering you before you break out your credit card.
