318 with PS.....What manifolds will fit?

This might not be your cup of tea, but you might consider a stock Commando single exhaust with the resonator Uses stock 65 manifolds and will give you the sound you want
thanks for the suggestion. If the whole exhaust system was shot, I'd consider this route but the rest of the dual exhaust is in great shape. I actually just replaced the mufflers with dynomax super turbos to try and quiet it down (didn't make much difference at all). So I'll be sticking with the dual exhaust for the time being.