Bought a Van......

Get you a factory service manual for it. That will show you the way.
honestly, i'd feel best if I pulled the tank and removed the electric pump and put a straight pick up in it's place, then run the mechanical fuel pump. He put a Comp Cam in it with the snout for the eccentric, but he said he didn't put the eccentric on it. I can pull the front down and put the eccentric on it then. Also, a good points distributor and I'd feel bullet proof, with a small bag of parts under the bed.