Tom,
 
If you are going to have the booster replated with the original gold (Zinc Dichromate) then I would highly recommend you talking to Steve Gregori at http://www.brakeboosters.com/ .  He has an advertisement in Hemming's Motor News every month.  I believe he only does GM boosters.   Had my booster rebuilt/replated, turned out great !  On the website it states "do not sandblast the parts".  The cost was very reasonable.  I am very satisfied with the results.  If you have any questions, just ask. :)
 
Hope this helps,
 
Kent
'68 Malibu ZZ502/502
ACES #5102

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