14" wheels for disc conversion okay?

I'm still digging out of a financial hole but like to plan ahead. I would like to convert my 68 Barracuda from 9" drums (it had a slant 6) to disc brakes. I looked at several options but most seem to say for 15" wheels or larger. I put a 15x7 wheel from my 68 Charger next to the little Barracuda and it is bigger than what I want to use. It seems like SSBC (Summit Racing) is the only one that carries a disc brake conversion for 14" wheels (larger bolt pattern). Is there anything wrong with sticking to 14"s? I plan to mostly cruise in the car and if all shakes out, it'll have a 360 under the hood.