You got the raised runner head and you want to run a shorty header? That exhaust is only going to kill that whole setup. Get a real size exhaust for it. Get the heads flowed at a good shop and have them help with a cam. This is the best way to figure this out. You are probably going to need more compression with those heads also. You are going to need a decent gear with that setup especially if the car has any weight to it. Probably need at least 4.10 with a decent size tire of 28 inches tall. I would make sure you get a good fuel pump and that carb might need to be worked on a little to work on those heads, depending on how everything flows. Just remember everything needs to work together and be matched to maximize performance.
Ken
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