Should there be a grounding strap from the engine to the body?

If you don't have groundS from the engine to the body and chassis the electrical system WILL GROUND somewhere. ......and that usually ain't good. Steering columns, gear shift linkage, speedometer cables, exhaust and any number of brackets will serve to act as grounds. I've seen a speedometer cable melted slap up from being the main ground. Can you imagine what that'd do to all the instruments in the cluster? Can you say French fry? You need to have several (3 or more) BIG grounds from the engine and or transmission to the fender well, firewall, fender, radiator support, frame rail and any other solid place on the body or chassis. Most electrical gremlins come from faulty grounds. Electricity WILL ground somewhere. If you give it the proper path that somewhere will be the right where.