Serpetine not timing. Locate the belt tensioner. Place a 1/2" pull handle in the square hole of the tensioner. Pull so that the tensioner rotates counter clockwise. This should remove the tension and allow for the belt to be removed(may need an extra set of hands).
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.
3rd Gen also. Follow the directions for a 91 & 92.
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.
700r4
Get the new belt and start by removing the alternator
it should be on the door lock motor on some early '91 models
Best way to do it is either a flatbed or a trailer
on the transmission tailshaft housing
There's a pin in the knob on the side facing your dash, under the grip is a double sided pin that looks like a giant staple, remove that and it will come right off!
it has its own belt use the belt tentionadjuster located on the alt itself its a bolt
yes it is fuel injected.