oh f*%k

Put a stock pickup in it and rev to 6000 instead of 7k.
I doubt there's much reason to push the rpm-limits with a 'fun' engine.

Enlarging the block's pickup thread usually means the hole has to be offset drilled and tapped to prevent breakage at the block.
Unless you have remote pickup like you show in the photo, then it's just an oilpan mod.