Need advice on installing an oil filter adapter

I wouldn't use that one on a performance engine; like said, she's quite a restriction. The HH type can be drilled out to better allow a HV pump to do it's thing.
As to the 90 adapter, I have seen a couple of hollow bolts, some with round holes, some with slots, some have a thinner wall with a bigger I.D The passage corners in the casting can be ported. I've also seen some poorly designed aftermarket long-slot ones twisted off, or ruptured.
I prefer the non-adapter on account of two less corners. I drill and chamfer extra holes in the plate, and center drill the HH fitting. Either filter fits my 367 with TTI's, in a 68 Barracuda. No rod failures yet, shifting at 7000.