My 383 is weak!?

Thats what my dad had figured it would do well for when he built it. Its the cylinder feeling like its dead that has us baffled. After I get my Dart suspension and brakes squared away the engine may come out of the truck and have a hotter cam put in it as well as the MSD system. It acts like it lugs to pull the truck but it has a mountain of torque.

you can probably do the cam in the truck but it will take some patience a nice smooth careful glide to get the cam in without scoring the cam bearings. lots of white lithium grease on the bearings and insert section by section, get a new grip until you get it all the way in.