Not keen on using headers, they all eventialy crack. The 350 I put in the truck had Edlebrook headers on it and both were cracked.
You say "manifolds". Many headers will fit. Have used Hedman, etc. Have used the long tube kind not shorty's. Used headers or Rams Horns are fairly cheap. Always try them before buying. Craigslist. The Vette ones, as mentioned, really breathe well.
