Just put new 86 350 in my 78 C20. The first starter i used would sick and crank with key off wires were not touching.The second turned over fine but i had a fuel leak so i shut down.Tried to restart and it cranked real slow and ground strap from engine to frame was smoking.I removed strap and tried new starter, battery fully charged but engine turns over very slow.Starter is shimmed and clearance seems to be right.Any ideas!