help with fenderwell headers vs performace

i have a 360 in my 1966 1/2 dodge dart 1/2 barracuda.. dart A CUDA WELL MY FENDER WELL HEADERS ARE KIND OF A PAIN MASTER CYLINDER GETS TOO HOT
EVERYTHING IS TIGHT ...IF?? I PUT STK EXHAUST BACK ON WELL I NOTICE ANY DIFFERENCE .........ENGINE IS 360 ..040 OVER... ELDERBROK ALUM HEADS... ELDERBROK PERFORMACE INTAKE AND RV CAM 204/204 @50 % IT HAS PLENTY OF POWER NOW AND ID LIKE TO KEEP IT ..ALSO MY STK MANIFOLDS ARE OFF A 273 MOTOR ARE MANIFOLDS FROM A STK 360 REALLY ANY BIGGER THAN A 273 OR 318??? I DONT KNOW ANY ONE LOCAL TO HELP WITH THIS DECISSION AND ALL ADVICE WILL BE APPRECIATED...
THANKS DAN