I have a 1978 Ford bronco and the C-6 tranny is leaking something fierce at the bell housing.  before i tear into this project i need to know do i rebuild the entire tranny or just the front seal?  i think its just the front seal thats causing problems cuz the tranny shifts fine.  if i change the seal out what other seals should i change, ie...pump seal?

i also am having a problem with my engine wanting to bog/chock down when i give it gas.  the motor is a '75 351 cleveland and has a edelbrock performer intake and an edelbrock 750 cfm carb.  is this too big?  should i go to a 2 bbl or a smaller 4bbl?  could it be a vaccuum problem.  i stumpped.  thanks