lively, we used a plastic with foam and gm sending unit in our nova. on the street the foam does cut down on the sloshing fuel arond in the cell which will happen every time u turn the car . i used the plastic because if i get hit n the ass there is a better chance of it bending out of shape than tearing like a metal cell. that one i have seen with my red beady eyes. by the way i prefer gm but i love that ranchero. i just traded for a 53 ranchwagon with a 383 chevy. thought about turning it into a gasser but im building a gasser right now . a glass 41 willys. good luck on your build!! ken