I've never seen 68-70 B Body pedals broken down to specific year applications regarding 4 spd set ups?, I have "69" pedals from a Roadrunner in my 70 Charger,...no issues, bolted in...I know there may be some issues with the brake rod attachment hardware regarding bore sizes, depending on what type of pedal rod your using, or booster set up, but that can be an issue just swapping brake set ups in that require a different booster/pedal rod, or intermediate linkage,...often solved with a bushing, or dilling/tapping to a larger screw stud assy/etc. etc, ...worst case senario, weld the hole shut, and drill/tap the require thread to reuse your old hardware.

Mike