The FC might not be faster than the contour in a straight line but it'll damn sure be more fun. (my mom has a contour, i hate that thing but hers isnt the SVT)

Either way they've got a point about the S5 motor in the S4 car, that can be a pain - you can either A: switch out all the sensors and stuff and use the S4 ecu and harness (which will still need some rewiring for things to fit right.
Or B: rewire the car harness to work with the S5 ecu and engine harness.
Or C: run a standalone and get it tuned - if you're going to do this why not get a turbo motor while you're at it? I'll buy the S5

options A and B are a pain in the ass and C is expensive.

BTW: the GL badge came on 86's it was the model someplace between the GXL and the SE - It had the same 4lug suspension as the SE, a sunroof, and ALUMINUM phonedial wheels (a real SE has steel phonedial wheels)
I've only seen like 1 that had the "GL" badge on the side