title basically says it all, i have custom headers made for a 302, but im swapping to a 1986 351W soon, i was wondering if my headers will bolt right up to my 351W, as i dont want to make new custom headers...

The flanges are identical, but since the 351 has about a 1 inch higher deck height, the collector will move slightly higher and further apart. If clearance was really tight before,you might have to heat up the tubes with a torch and bend the header a bit.