slant daily driver buildup

Have to agree with 66aCuda. The '73 is a better starting point since it has induction hardened valve seats for unleaded gas. If you can't find the crank register adapter, you can use a flywheel or flexplate/converter from a '68 or newer slant. The only thing I would add to the list is a 2 1/4" ID exhaust system. You'll be amazed how these few changes wakes up the old slant. You should get anywhere from 25-30 MPG on the highway in your light early A, depending on transmission type, rear gearing, and the weight of your right foot.