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Re: New issue. Now the brakes.
That's a "stock type" single diaphragm booster.. Not my first choice for a modified engine with lower than normal manifold vacuum, but will probably be ok for your "mild cam" application.. But the booster is not your problem... If the booster was defective or not compatible with your engine, you'd have a hard pedal, not a soft one that sinks to the floor... That symptom indicates a leak in the hydraulic system, air in the system or a defective master cylinder..
Concerning the rear drum brakes: They are self adjusting and will maintain proper adjustment as you put miles on the new shoes.. BUT-- You have to give them a good "starting point".. The way to do that is to tighten the shoes up so that you can't turn the wheel by hand.. Give the adjuster 3 - 4 more "clicks".. Then loosen the adjuster until you can just rotate the wheel.. You'd think the shoes are still too tight but it's the newness in the shoes coupled with the freshly machined drum surface.. After applying the brakes a few times while driving, the shoes take a set to the drums and will have the proper clearance...
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