oil filter/ex manifold interference Q

There are several small diameter oil filters you can use. As long as the internal thread is the same and the seal is the right diameter they work fine. I ran a 340 in a drag car for years that way. I’ll get some filter numbers for you and post them. I never liked the sharp turns in the right angle adapter. Bolting directly to the block is best, I used the small filters for header clearance.
I also doubled the amount of holes in the plate for better flow.