1966 Barracuda disc brake conversion..will my Mopar ralley rims fit?
 

Doing a front disc brake conversion. Will my ralley rims fit over the calipers? they are 14" 5x4.0

It totally depends on the kit you use, some convert to the 5 on4 1/2" bolt pattern and some don't. Some only fit 15" wheels. You need to go over the information on the kit to determine what your asking or contact the manufacturer.

https://moparforums.com/forums/f9/1966-barracuda-disc-brake-conversion-will-my-mopar-
 

I checked, the kit is 5 x 4 1/2 so my original ralley wheels wont fit. If I get 15" 5 x 4 1/2 mopar ralley rims will the rims clear the caliper?

I'm trying not to be rude but your asking the wrong place, ask the seller or the manufacturer. We have no idea what kit you're looking at and there are plenty of them.

10" Caliper... and OEM wheel spacing.... Should fit.... As long as it is similar to the 73-74 A-Bodys