I have a 83 k10 p/u and an 84 k20 suburban. I am thinking of taking the 350 out of the k20 and puting it in the k10. Are the mounts the same? Also i haul trailers quite a bit and the 3 speed on those doesn't work as well as a 5 or 6 speed for this purpose. Will a 5 or 6 speed tranny from a newer model fit into the equation? Still need a manual tranny though. Any imput would help.