Rarity?

While looking for parts for my 68, being told that a late 68 with a slant 6 and manual drums is a bit of an odd duck. The premise being that most cars were 8's and with power brakes. Is this correct?
not rare, there were 7200 225 slant 6s sold in that model and delivered in 1968. there were 9820 318 notchbacks. and manual drums were common as heck up until 73/74 when everything started switching to power discs.