bought this '74 Chevy C20 in the early 90's for daily driver.. retired CHP truck came with 350/4 speed.. could hang meat in it with the a/c on..
long horse trade story but in a weekend I put my 4 speed and high perf 12" clutch in a retired caltrans truck and scored a '76 auto donor.. took it's 400 auto, cross member, low hump pan and made a cover, auto column, pedals, etc.. other than carpet, never could tell the difference..
let one of my buddies talk me out of it in the late 90's, even put a new crate 350 in it for him labor free