340 hp exhaust manifolds

To use the 340 hp manifolds,do i have to use the 90 degree oil filter,or is the straight on work.I ask because I am looking at a set of exhaust manifolds and the guy says i have to get the 90 degree oil adapter.Does not smell that good to me.This is for my 360 build.
you got any pics of the manifolds this guy is trying to sell you? the 340 pieces (like abodyjoe is showing in post 15) are (from what I know) quite rare and can be expensive.. can I ask you how much he wants for them?