x-3 A big cam means it will require more gas and u state that u want to use the 2 ble carb. These guys are correct- it is not that easy. Many other engine parts involved. Change the mufflers if u just want sound. That's the cheapest and least "intrusive" thing u can do for a better sound. I've got a set of headers and "regular" muffers on my 283 and it sounds like a big block!! Well- almost.

'52 3100 "once a Marine, always a Marine!!