Im looking at a 69 car does not have original motor or trans rear is supposed to be original here are the number's BT0321 G2 E. also has 12 bolt 355 gears are these original ? Car is 1969 Camaro Convertible, RS optioned X-11. Was Floor shift auto. Has 03D build date. any ideas on what 350 hp rating might have been in this car,IF THE REAR IS ORIGINAL Any help appreciated.

BT=68 or 69 3.55:1 12 bolt Posi Unit
03=March
21=21st day of March
G=Detroit Gear and Axle Plant
2=2nd Shift
E=Eaton Posi

Yes, probably original.

350ci/300hp, if the rear is original. Post the cowl tag info and VIN on here, and someone will tell you how everything lines up.

Cowl seq is 2885XX, vin 124679N6211XX. Car is also original 79B paint code.
Has 03D build date
This is what i got from my request for information