Lining up PS pump mounting bolt on newer heads

Hi everyone! Wondering if anyone has experience doing a roller swap. I have recently swapped in an engine from a 1985 Mustang GT and am in the midst of buttoning everything back together. Am noticing that the hole for the PS pump mounting bolt is larger than the bolt off of the 289. There is a hole that works slightly to the left of there but then it doesnt line up with the bracket. Anyone else run into this and have some solutions? Thinking of either finding a fitting that shrinks the hole or to grind out the bracket hole to line things up better. Open to suggestions.

Thread inserts:
Thread Inserts Link Ebay

You should check out this link for other details on a swap like yours:
302 to 5.0 engine swaps

Thanks for the link. Good read through. Had known about the other swap items and had executed those (50 oz stuff, oil pan, thermactor holes, dipstick hole in block needing plugged, etc.). 1985 GTs had carburetors so already had a fuel pump eccentric. I swapped over a new timing cover too so i could mount a dupstick at the front. This seems to be the only swap thing I missed! Thanks again for the reply.

Further investigations reveal there is already a plug with internal threading for a 7/16 bolt. My PS hinge bolt is a 3/8 (i think) and is too small to work with the insert. Im going to a fastener shop today to see if i can get a solution. I have read that some ps pumps used a 7/16 bolt so may have to bite the bullet and see if i can get my hands on one of those if this doesnt work.