very mild 360 build.
the melling MTD cam is going to trade torque all the way across the board for HP at the top. it's still a good cam, that's similar to the factory 340 piece.
personally i'd choose the MP cam. the split pattern will work favorably with the exhaust manifolds and the narrow 110 grind will keep the torque where you want it all thru the midrange. it's a typical RV style grind that'll make a butt load of torque and not be all peak power. i think it would compliment the direction of the build.