65 Barracuda converting to double master cylinder

I did the same swap on a 65 Fury years ago. The master cylinder bolted right in place, pushrod snapped right in. The existing line from the master to junction block, screwed into the rear port on the new cylinder. Then I unscrewed the rear line from the junction, plugged the port on the junction block, and extended the line with a union, a pre-made brake line and an adapter bushing at the master cylinder front port. Seems to me the whole job cost about $35 including brake fluid, and took about 1 hour (I work pretty slow, and stopped for a beer mid job).