hydro booster!!! brake hose?

70-72 would be for a kelsy hayes 4 piston caliper. 73-76 would be single piston chrysler.

Hydroboost is not required. It is only used on diesel because they generate such low vacuum. Unless you have installed a very big cam you should be fine with a vacuum booster. I would hate to see the effort required to retrofit a hydroboost into an A-body. I have always thought the hydroboost trucks had a strange pedal feel.

If you don't have enough vacuum it would prolly still be easier to just add a vacuum pump for the booster.