I had a 82 Mazda rx7 that I put a Chevy 350 into, and let me tell ya.... The oil pan was one part that needed some "adjustments" to clear the center/drag link for the steering. I set it on the ground in my shop and beat it till the flanges weren't square anymore. When I went to install it, I used gray rtv, had to squeeze the sides to make the bolts line up. It didn't leak a drop tho, and it cleared the steering!!
Pros: didn't leak a drop
Cons: needed some adjustments
Vehicle:
Mazda
