Happster's '72 scamp build!

I think before you do any more work to your stock heads (if you plan to do so) you should look for a good pair of #302 castings from a factory 318 engine made between 1986 and 1991. These heads have smaller, more efficient closed chambers and take very well to porting.

As far as headers go, most will agree with me that for the street the only good choices are Doug's or TTI, both pretty pricey and IMO not really justified for a mild street engine. I believe it was Mopar Muscle Magazine that did a test a while ago on a mild crate 360 and found that only a few (less than 15) HP and lb-ft. were lost when going from top-dollar long-tube step headers to stock log-type exhaust manifolds. I'm building a 318 similar to yours right now and I'm just bolting the old manifolds right back on.

Also, what do you have planned for a cam? The stock 318 one sucks. I have a Lunati Voodoo 256/262 ready to go, I think it or the 262/268 cam would work great in your car.