5.9 magnum intake performance

anyone running a mopar perf. MPI intake and getting a considerable gain in HP over the keg style...im gonna put a 5.9 mag, computer harness, injectors, etc in a 78 ramcharger mostly just for a better power reliability and mpg gain. what i plan on doing is putting a 5.2 mag cam in 1.7 rockers a 50 52 mm throttle body a cpu chip and mabey a good cold air. my question is is that intake worth the money over the keg style even though the belly likes to blow out