Lunati is a pretty good cam, but I'm going to agree with everybody else- - - - -the engine in stock trim has more power than you'll ever be able to put to the road with it in a stovebolt pickup, unless you plan to keep the bed filled to the top with gravel all the time. Just drop the thing in "as is" and put a pretty decent set of rear tires on with as wide a tread as you can manage without modifying the fenders. I'd also agree with doing a front frame graft from an Olds Cutlass or something similar instead of going with some sort of hotrod IFS system. You'll have a steering and suspension system that actually works, and the engine will be a drop-in fit on the motor mounts. Check out the track width- - - -any Olds frame that the 455 fits might be too wide for a Stovebolt. A 1970's Chevy Nova front frame clip might be a better choice, even if you have to tweak the motor mounts a little.
Jerry