the most accurate numbers available are in GG's "white book":

1970 Plymouth E-body convertibles:
BH27 - * 1554 total shipped * Barracuda ~ 1387 for US (Y05) and ~ 167 for CANADA (Y07) & EXPORT (Y09)
BP27 - * 596 total shipped * Barracuda Gran Coupe ~ 547 for US (Y05) and ~ 49 for CANADA (Y07) & EXPORT (Y09)
BS27 - * 635 total shipped * 'Cuda ~ 548 for US (Y05) and ~ 87 for CANADA (Y07) & EXPORT (Y09)

2785 total shipped