no. the 68-up disc brakes use a totally different spindle. if you're going to use a stock style disc system on your drum spindles you'll need the 67 style disc brakes. the SSBC kits are based on the 65-67 style discs. 67 are slightly different than the 65-66 but use the same style caliper. the fluid transfer lines are bigger on the 67 and the pistons are a little shorter.
the best setup for your car using the drum brake spindles would be the 67 disc brakes.