408 cam / build help.

That's the smallest cam that Comp makes optimized for MOPARS should work fine if rpm range is ok for you (weight, gears, converter, driving goals)
note one of few times I have ever said a comp cam might be ok
advertised rpm range is most likely for a 360
If asked I'd sell X heads but we are not getting into heads now are we
just check for sunk valves etc and do your thing on them for now
with that lift cut the guides new viton stem seals-- if guides are trash- tilt