I hope your truck still has a 360 right? it will have to be a NV4500 from a 3/4 or 1 ton 2wd 360 gasser, bellhousing should bolt right up but it will have the provision for a crank sensor, no biggie. and it should have the external hydraulic clutch assembly with the gigantic saddle looking monster for a release fork. As stated, trans mount and cross member will require some mods, as well as driveshaft length and the yokes. If possible save the flywheel from the donor truck too, since in 79 trucks had the 11 inch clutch, and 94+ used 12 inch setups.