Whitney did not have anything for older cars. Summit has this:
http://www.summitracing.com/parts/RPC-250-1223
Back in the day, everybody and their brother had kits for carburetor cars, Dana being the most popular. Today, not so much.
Craig

2014 Ram 1500 Laramie, 73 Cuda
Previous mopars: 62 Valiant, 65 Fury III, 68 Fury III, 72 Satellite, 74 Satellite, 89 Acclaim, 98 Caravan, 2003 Durango
Only previous Non-Mopar: Schwinn Tornado