47-59 53 GMC longbed project

[dsraven]

for your 12v conversion, did you order a 12v alternator? which one-how many amps?
original 6v starter will usually handle the 12v if you have an engine that is in good shape/state of tune so the starter doesn't have to crank for very long before it starts, like a couple seconds. to swap in a 12v starter requires some work because the ring gear on the flywheel and the gear teeth on the starter are different. there are lots of 6V starters being used on 12 volts, just don't expect it to last if it has to crank for awhile before the engine starts. crank for a couple seconds, then let the starter cool off for a few minutes otherwise you will burn the contact plates off the armature in the starter motor. a good starter rebuild shop would be able to set up your original starter so it has what it takes to handle 12 volts, usually the field windings need to be swapped out, but most guys use the 6v starter on 12 until it cooks, then just get another 6v starter and carry on