Hmmm. Do I sense a Turk/Semko package deal for two alloy cars from... "Darth Vader and the Death Star".
Dan: I don't think Shelbys are set up for 6 cyclinders or 4 cyclinders. Heck why stop there. Go with a NB (no block). You could be the first on your block with a peddle power Cobra. The conversion for the chasis would be a breeze. Ever consider that?