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...the piston has pitting and a vice grip indention as does the piston on the end of the push rod.
Get a repro - available in stainless.
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looks like the bleed back hole was closed off by the plate gasket.
Though the gasket extends around the back hole, isn't it actually open to the reservoir by virtue of the channel that's stamped along the perimeter in the cover plate? Though it's been several years since I rebuilt one of these units, I seem to recall that was the case with the gasket on every one of the half dozen or so that I ever removed the cover from.
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also note that the vacuum hose was wired on to keep it from coming off for whatever reason.
I've only ever had a problem with that hose coming off when it had been replaced by a piece of fuel hose, which is simply too stiff for the purpose. The formed/molded OE hose was more pliable and had sufficient grip to stay put. The one in your pic looks more appropriate than fuel hose, but appears to have been cut from a bulk roll. That wire, however, is a poor choice to cinch it.
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this unit has obviously been broken into before.
Yes, the residual check valve is of a later production design and superceded the original design for rebuild.
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I also have no idea what that gooey fiber material was between the floor plate and the canistor top. i guess to keep water from getting into the car idk. i'm guessing some black rtv will be a suitable replacement.
Should be a gasket, but I don't recall it being gooey. Perhaps whoever was into this one coated the original gasket material with some of the tarry aviation gasket sealer for reuse. Rather than waste so much RTV, the shape is simple enough to cut a new gasket, but I'm not sure what material to recommend.
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