Hooker headers with Milodon 8ct pan

Might have to "adjust" the headers a bit.... or modify the pan sump. (I'm assuming the triangular sump pan. You can use a hammer and drift on the headers, if you need to spread the headers you could use a ratchet strap or come-along tied to a tree.
I had to modify the front corner of a milodon triangle sump pan to clear the headers for a big block C10. Cut the corner off at an angle till the headers fit, then welded up a piece of sheet metal to seal the hole.
Edit: the ONLY set of headers that I've ever had that didn't need some "adjusting" was a custom set, welded up on (and off) the car. $1500 when a set of hookers were under $200.