piston questions

Being that you brought up manifolds for a carbureted magnum
What would you suggest in a 3/4 ton truck w/a stick and 3.55s that tows besides being a daily?
I'm thinking for cam something comparable to a comp 260- comp 268ish only in a roller equivalent.
1- airgap
2- hong kong phooey knock off airgap

that's the whole list.

okay, okay, if you can find one and you've got money to burn a M1 dual plane.