What kind of horsepower gains can i expect from a super six intake and carb with mopar performance headers on an otherwise stock engine? Can you use mp headers with 14" wheels? will they clear the factory starter?

20 to 30 HP is my guess.
As far as the MP headers fitting, that is a "crap shoot" seeing there is a lot of variation in the cars and the headers.
Maybe someone who has install a set recently will report-in on how their installation went.
DD

73 dart, i am doing just that swap on my 225 in my 74 swinger......as soon as its warm enough to get in the garage. brrrrrrr. im figureing it to drop me a second in the qtr mile....i hope. thats pretty significant but it seems about right from others i have talked to. should get me down to a stocker 318 level i hope.

--chad

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74 swinger slant 6, the slowest, most fun car i have ever owned.