Geez, you sound like you are in the same boat I am, own a EL fairmont Ghia, thinking of how far I will go doing it up,
If I do, this is what I planned,
2.5 Inch straight through mandrel bent stainless system, ceramic coated extracters, high flow cat
Open up the cold air induction, either larger spout, or rampod, short term, long term a low boost supercharger, powerdyne, maybe around 6psi
New Torque Converter, maybe high 2000's
This sort of stuff, hoping for around low 200kw's, want it to be nice and smooth..............
I would suggest talking to Robert Herrod, at Herrod's Automotive in Thomastown, 103 Northgate Drive, Vic, 3074