mufflers or no mufflers??

those manifolds came off my original 273 but the owner who had the car and good friend said the came off a 340. but i do not know much about mopars since this is my 1st. ill look around for a set of 360 manifolds so i can see what they look like. everyone says tti or spitfire. im hesitant to buy them since i do not know for sure they will fit in my tiny engine bay with out mods and im not pulling my motor to cut holes that i spent hours filling. but in the end i might have to or just sell it like im planning on doing but wanted to atleast enjoy the car before the 4sale signs go in.