350 Vortec Remote oil filter adapter to filter what do I need to plug?

I have a 350 vortec one piece rear main block and I plan on using this block for a Racing application. The fuel pump rod problem is taken care of. My problem is the oil filter adapter. In my class i cant use one. I have to use a straight up filter. I have the adapter but i am under the assumption that i have to block off a hole in the block. ANy help would be appreciated. Broyles Racing350 Vortec Remote oil filter adapter to filter what do I need to plug?
If you remove the adapter, the standard oil filter should just screw on. You may have to use the threaded piece from the adapter on the block, that should be it. But there may be a bypass depending on the year of the block