A friend of mine has a complete, running /6 & noisy but working 4speed O.D. 833 attached to it from a 2wd 76 D-100 pick-up he has. We are installing a 6.4 HEMI & 6speed in this truck. The slant 6 has an aluminum Offy 4bbl manifold & Holley carb & factory electronic distributor. He wants to sell...