Since nobody else answered the "second question"....
... I'll jump in!
An FE motor is the
original Big Block Ford
The motor first came out sometime around 1960 in its 332 cid incarnation. Then to 352, 390, Lincoln's 406 and (of course) the legendary 427
Also along the way came the little-known Merc 410, the Ford truck 360, and (of course again) the 428.
The 390 in the GTA you're looking at was used in 'Stangs, larger sedans, and pickups. In it's normal stock form, it wasn't exactly a killer motor; but they can be built pretty heavily - there was a '68 T-Bird with a
factory 345-horse (California dressing) 390 that was pretty doggone quick especially when you considered that it was hauling around that bloated 'Bird. Well-built 390's were famous for their torque, rather than their HP ratings.
I once had a '72 F100 for which I built up a Linc 406. It was a torque-monster that could haul just about anything that I hung on the trailer hitch. When it was empty....
Passed everything except a gas station.
And that's the "short form" of the FE story.