You could always leave the holes...maybe shrink them up a bit w/ metal and install a GT style front mounted oil cooler
Since the hole is already there, might as well go hole-hog and do a GT conversion, haha.
Seriously, I'd say just find an old rust bucket parts car and cut the part off you need, like what John2kx did.
Speaking of John2kx, I have a question. You filled in the hole, but you are putting a v8 in yours no? Won't you have to cut a new hole to let the radiator air out? Good looking patch though