Hi greg--------------Just about any 5-speed from '78 to '83 will work. Most folks prefer the combination of an '81 to '83 trans coupled with the 3.90 R-200 differential from these same years. '78 and '79 5-speed ratios are similar to the 4-speed except for top gear. '80 5-speeds are unique, and have less desireable ratios for this swap.
roadman!!! just realized you were from gulfport. i'm in biloxi and would like to talk to you about this info you just gave.....can u email me your phone#? or i'll just give you mine and call me. few other questions too. chris.