I found Hedman headers to fit FGF well and be cheap. But the last pair I bought was a long time ago, and had 1 5/8 primaries. I used an angled oil filter housing off a GTO, the straight one put the filter right on top on the pipes. Steering cleared fine but was manual, can't vouch for PS.
Wanting a Custom fit in an off the rack world.
I don't have time for a job, I just need the money.