No spool mount in 68 or 69. They used a block type mount that dropped into a pocket on the front of the cross member for automatics, or in the middle of the crossmember on manual trasnmission cars. There is a difference of cross members.

68 Road Runner (383/4speed, post car w/decor pkg) - Major Project
69 Road Runner w/472 Hemi & 4 speed.
70 Challenger R/T SE EF8 w/ V9J, U - A32 - Major Project
2023 Ford Mach 1