For me spending money to make a 2.8 a 3.4 is not the way I would do it. check the Heads for a part number. Iron Or Alum.? I really didn't look as it was in the Air. I know the Block is Iron. I think early B O P C every thing is iron later V6 is an Aluminum Block and Buick had alumnum Heads w Iron Block.
The heads are iron. Same as the Fiero's. (Which, coincidentally, are the same as the Camarobird 3.4.) Everything about the engine looks "stock Fiero".
The first time I saw this car was in 2000 or so.
The engine was done similarly to the way ARI does their 3.4 stroker kit.
http://www.engine-parts.com/GMV6/gm2834stkr.htmland
http://www.engine-parts.com/GMV6/V6answers.html Edit - Boring/stroking a 2.8 to a 3.4 wouldn't be my first choice, either. I think there are too many compromises built in. (For example... the cylinders are so thin, that there's NO room left for a rebuild/overbore.)
But remember... This was done before people felt comfortable changing ECMs, and installing DIS, and all the other "magical" things that can be done, nowadays. A whole 3400/3500/3800 powertrain swap is almost a commonplace thing, these days.
Heck... I spent a small fortune building up an engine that
started out as a 3.4. It went like hell, for what it was, but it was way down, in the "bang for the buck" department. I wouldn't do it again.