Go to Autozone, tell them the car year, make, model etc. They will give you the right number for the headlight; even if you don't buy them there.
It is next to the headlight there are three bolts that hold it on.The knob that you can turn to adjust your headlights it is rigth there.
Any size SBC engine will fit and is compatible with a 91 Firebird. A 350 engine is the most common that is used for installing in a 91 Firebird.
camero and firebird are identical. parts of the nova can but not much
Yes
77-81 will interchange.
I calc'ed my '91 V8 Formula Firebird to be about 18 mpg.
A firebird can't "have" third gen. It either is or is not a third generation firebird, and Yes, a 1991 is a third generation.
Yes.
Need to know what you want to interchange them with.
700r4
NO.
when laying on you back looking at the regular fuse panel, on the other side of the steering column there is a box about 3"x3". unplug that box and the fuses are vertical above where that box was plugged in