[6T7 C10]

The 260 hp version would be better for a pickup. However a better option and surprisingly cheaper version at least per Summit would be the L31 long block. You gain much better vortec heads, compression, roller lifters, no need for zddp oil, better matched cam, and extra ponies. You would need a vortec specific intake manifold and an electric fuel pump. I maybe biased but I went this route in my 67 C10. There are also good 383 long blocks for similar monies. If the truck is original then rebuilding the engine that came in it should be a viable option.

Okay I just read you have the 290 already. That changes things a little. If it is not already installed and time/monies allow you may want to put in a better matched cam. Either way stay with quality small diameter long tube headers, 0-5000 rpm dual plane intake manifold, 500 cfm vacuum secondary carb, HEI distributor, ZDDP oil, and <2000 rpm converter to make a nice little combination for a truck on the street.