Chevy Ram Horns have good flow and look good. They run up to 2 1/2" on Corvettes. Nice fit and A/C mounting. They don't leak! Craigslist, Ebay or Stovebolt. The diff between those and headers would only be about 2-5 HP on a stock 350. There is a pair on my Craigslist (Phoenix) right now for a mid 70's Corvette, $40. Search: ram horn to see what they look like. There is no way of knowing for sure if a pair of manifolds fit with a certain engine swap until you try them. Each swap has a little different engine location. Most V8 exhaust manifolds, headers or otherwise, in TF trucks are very close to the steering box.
