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1. Will the current master cylinder and vacuum brake booster work by adding the proportioning valve? This vacuumbooster is almost new but differs from the donor system in that it has the large flat booster whereas the 72 booster is much smaller in diameter but much thicker. Why?
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Don't know about the booster, but you will need a disc/drum master cylinder.
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2.Is it necessary to have a seal between the master cylinder and the vacuum booster?
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No, but I'd at least use some RTV to keep moisture out.
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3. Does the pedal rod length to the firewall make any difference?
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Yes. Adjusted out too much (long in length), the brakes can drag due to pressure being applied on master cylinder even though no pressure being applied to brake pedal. Adlusted in too much will require more pedal movement to acheive maximum brake effort. Might not be getting full pressure from master cylinder to brakes.
Make sure to bleed the master cylinder first, then proportioning valve, right rear cylinder, left rear cylinder, right front caliper and left front caliper.
IMO, hope this helps.