I'm running the stock 350 TBI and injectors with the "ultimate" mods at 20psi.





I had Hedman headers at first and they fit great but rusted out after only a couple winters. I put cheap stainless OBX headers on that fit like absolute garbage, but have held up well. I had to cut and re-angle the 4 tubes on the driver side and both collectors.

If you're worried about fitment, just bash em. I was amazed at an episode of Engine Masters where they tested power loss and it basically did not matter at all.
https://www.youtube.com/watch?v=azPKIjxmmdU