[Rev]

While the 302W/351W heads have the same exhaust ports, some of the 5.0 heads (P heads come to mind) have different exhaust ports. The 351w block is somewhat taller than the 302W/5.0 block. You will want headers for 5.0 block as mentioned by FatOeknee. If you have "P" heads, then it's a whole different ball game.

Rev