Will a 70 dodge superbee ralley dash frame interchange with a 68 dodge coronet rally dash frame ?

I would have to run the supercessions to be sure, the part #'s in the book are different. The 70 book has options like A/C as well.

I would say though that if the 68 Coronet frame is from an R/T, Superbee or other car with the round rallye guage package, and the 70 is also (with no A/C) it is quite likely to work.

If you are trying to change from square gauge to round---no.

The dash pads are different. 68 is pointed 70 is not. The mounting for the ignition lock is in dash on 68 but in column on 70. 68 radio is thumbwheel and 70 is knobs. And if they are ac they are different. But you might be able to make them work with some mods. Bill