1970 Challenger convertible production numbers

from Dodge & Plymouth Muscle Car RED BOOK:
JH27C0B ~ 378
JH27_0B ~ 2543 (318, 340, 383 2bbl & 383 4bbl)
JS27_0B ~ 963 (383 4bbl 440 4bbl, 440 6bbl & HEMI)

3884 total (US spec. Challengers)

from GG's "white book":
JH27_0B ~ 3173 (/6, 318, 340, 383 2bbl & 383 4bbl)
JS27_0B ~ 1070 (383 4bbl 440 4bbl, 440 6bbl & HEMI)

4243 total (includes 359 Challengers built for CANADA & EXPORT)