What would you do.....?

Want some opinions here since I can't decide what I should do. I'm planning to build my roller cam 360 into a 408 with Edelbrock heads & a six pack. It's going to go into my '64 Barracuda. The car has a 4 speed with a 10.5" clutch & 8 3/4" rear with 3.91 gears. It's going to be a fair weather cruiser but I might take it to the strip just to see what it could do.

The car was cut for Cyclone 1 5/8" fenderwell headers in 1976. I still have the headers & they're in good shape. I also have a very nice set of 68-70 340 exhaust manifolds.

Should I just stick with the headers I have? Patch the fenders (I have the sheetmetal to do it)? If I patch the fenders, should I run the 340 manifolds (I hear it's hard to fit anything larger than 2 1/4" pipes to them in an early A) or headers (TTI or Doug"s)? Opinions on the them? I kind of like the Doug's better but they also seem to be the most expensive. I'm wide open here. Running the headers I have would definitely be the simplest & cheapest, but not necessarily the best way to go? What do you guys think? :dontknow: