[knomadd]

I'll give you a few generic items that cover more than just the 65 C10.

Motor mounts (adaptor plates, engine stands or custom)
Accessory Drives (will factory fit or will you need replacement brackets and accessories vs. trim the frame for clearance)
Headers and exhaust system
Oil Pan (will it clear the cross member/hang too low - Possible swap needed)
Fuel pump and regulator (in tank pump (sump or baffling is best) and corvette style regulator is a good option)
High pressure EFI rated fuel lines (not carb style low pressure rubber)
Fuel fittings
Radiator
Transmission cooler and lines/fittings
Replacement gauges or sending units for factory gauges
Driveshaft
Rear Gears
Throttle pedal location/mount (typically for DBW systems)
Throttle cable (for DBC systems)
fuse block (if wiring or cutting a harness down yourself)
wire harness (to be cut down or buy one already done for stand alone)
ECM/computer tuning

This isn't everything as some of these are broad items, but it should get you started.