What GM create engine to buy for 3/4 ton 72 C20

[garyd1961]

Originally Posted by truckster

If you want a crate 350, the L31 Vortec is an excellent choice. You'll need an intake manifold and electric fuel pump, but you'll get a one-piece rear main seal, a roller cam, and the best-flowing heads GM ever produced for the SBC. It should be good for around 300 HP, but the usable torque curve is much broader than that 290 HP engine you're looking at.

This^. I have had mine for about a year now and couldn't be happier with it. Mine is in a 1970 c10 long bed and it will get down the road. I have a Summit Stage 1 intake, Holley 4 barrel and headers with 2 1/2 inch exhaust.
ETA- The center bolt valve covers like the one piece rear main seal don't leak like the old style does. I didn't like the center bolt valve covers at first but now I prefer them over the old valve covers. No need to tell me yours don't leak because everyone knows they leak sooner or later, usually sooner.