For my 71 runner, going for the 6.1. With head work and cam upgrade goal is 450 at the wheels. Yes using F.I., using 518, using the MSD iginition setup, using alterkation, TTI headers and exhaust. I will go with 4.10. 28" tall tires Should have the fire without the O.D. and cruise with the O.D.

I have seen 5.7 going for $600. How can you go wrong?

P.s. weight of motor about 560lbs.

Too many pluses to not try this combo.!