All the Revell Grand Prix kits of the 90-95 series had 3800 (3.8L) V-6 engines in transverse orientation with transaxles. I believe there were at least a couple Firebird kits that had it in longitudinal orientation.
Dittos to everything Bill said!
Great looking model!
My only critique would be that exposed hemi engines just never look right without spark plug wiring at the very least.