66 Barracuda drum to disc conversion

like others mentioned i'd skip the discs unless you're going to autocross/track the car.

deciding on keeping the small bolt pattern or going to the big bolt pattern is kind of the king pin of this whole swap. keep in mind if you go BBP up front, you have to upgrade the rear as well. BBP has more options in wheel selection and choices in brakes.

another consideration, especially when upgrading to an aftermarket kit, is parts availability. also note that some aftermarket small bolt kits do not fit 14" wheels

if you're going BBP, my vote would be for the dr. diff 10.95" kit. 10.95" Front Disc Brake Kit (Stage 1)
Well i plan to get modern rims, 17 or 18. And you dont think the price difference between front & rear disc kit, is about the same as front kit and new drum & rotor ?