It all depends on how you want to go about the swap.
There are a lot of companies that sell the swap for your car. I personally have never used any of them. I prefer all factory parts, or at least all that I can find. Any GM mid size car from 1969 to 1972 will work. Chevelle, Nova,(actually Nova up to 74), Monte, and it does not need to be just Chevy, Pontiac ,Buick etc also work… If you find a donor car make sure you get everything, including the combination valve, and the little brackets that hold the brake hoses, they are different from drum brakes.
The complete set-up can be tough to find but there still out there. I used to part out Chevelle’s back in the 80’s early 90’s so I always had them. I am down to my last set and I am holding onto them.L.O.L.
Somebody else will have to talk to you about the aftermarket kit, but I have herd some not so good things about them.