I have an 82 K20 that I am building...it had an SM465 with an NP208....I want to know what I can do here, I have a TH400, how can I use this trans with the NP208? Or what about a 700R4? I have a 700 but no output shaft or adapter. Anyone know what my options are here and or what mods I can expect as far as drive shaft lengths? Thanks!