Welcome to CHR!
I like the 402 motor – great truck motivator and they can be built on a reasonable budget. I would champion what Dave said, re; roller cam. The 402 was originally a flat tappet design so you’ll need to be careful on the selection of aftermarket lifters. The Comp Cams roller replacement part number 854-16 works in the 402. They’re dear ($425), but they’re a quality item. Pat McCarthy will probably chime in with other suggestions as this is what he does for a living! A note of caution here – because the roller lifters are taller, you will need shorter push rods if you stay with the stock heads.

There’s a whole bunch of roller cams that will work. Tell us what you’d like to achieve and give some detail on which truck you working on, rear end ratio, tire size, auto or manual transmission?

Lots of knowledge here and we love to help!

Regards,
Glenn