If I can make a suggestion, 1991-1995 318/360 magnum V8 with a 1991-1995 46RH (A518) overdrive automatic, then you can run 3.73s in the back and still cruise at 2,500 rpm on the freeway. The magnum V8s are machined with LA V8 mount ears on the block, a regular vacuum advance electronic distributor fits, and they make intake manifolds with a magnum head pattern. Find a shot Ram Van or pickup with that combo. You have to mod the trans crossmember to fit. The OD trans uses an A727 sliding yoke