It'll be fine if you put it on the piping on one bank of cylinders. Pacesetters seem like the easiest headers to do true duals with so you will have to weld in a bung. I'd stick it on the crossover coming down so you have more room. Kinda like where ZZP's headers put theres.
Might be a ***** to get both pipes to fit all the way back with clearance...