How many 87 Formulas had certain engines

We know that ONLY the Firebird came with a V6, (Formula, TA & GTA did not have this engine option) So we can eliminate 34,914 Firebirds having a V8, leaving 7638 Firebirds with the LG4 (The base firebird was not available with TPI)

That leaves 18322 Formulas and T/A's with the LG4

According to http://www.geocities.com/MotorCity/Downs/9635/87RPOFigures.html The T/A & GTA's combined had the following production: 12,402 5.0L (LB9) and 7818 5.7L (L98)'s   That leaves:

5667 Formulas had the 5.0 (LG4) 4bbl

3931 Formulas had the 5.0 (LB9) TPI

3562 Formulas had the 5.7 (L98) TPI

12655 T/A's with the LG4

9124 T/A's with TPI  305 or 350

Transmissions:

Since the M5 was not available with the 350, that leaves 65,871 Automatics for the lesser engines.  Again according to http://www.geocities.com/MotorCity/Downs/9635/87RPOFigures.html there were 27,007 Automatics between the GTAs & T/As,  that leaves a total of 50244  Automatics for the Firebird and Formula.  5868 GTAs & T/As with a Manual Transmissions,  That leaves 5468 Manual Transmissions for the Formula & Firebird.