in too deep: trying to go BBP on a 68 barracuda and its going.. poorly.
10" drums all around are fine for modern driving. My brother and I put close to a million miles on 64, 67, and 68 Barracudas from 273 to 383 with 10" Drums. They handle and stop fine. We don't run the cheapest stuff though. I've had everything from 9 in drums to 11.75 pinned calipers on them also.