Tapping block for remote filter

Can anybody provide guidance on the block tapping conversion to use the two 3/8 NPT fittings for a remote filter/cooler install on a MP 340 small block? The two holes are so close to the edge of the filter lip there is no way that neither a straight nor a R/A AN-8 adapter will work without some serious metal carving. It appears that maybe a couple of 45 degree ones will and clear everything.

Anybody done this mod and directly connected AN fittings? (not using hose barbs). What needs to be done to tap the outlet hole? Does it need to be pre-drilled, or can it be directly tapped? Suggestions?

Thanks!

Mike