1993 : Had to stand on my brakes to get them to actuate, all the while hearing a sucking sound under my dash.
Replacement comes in two cash categories, plastic and metal. Which would be better. Any tricks or tips?
Well, replacing the power brake booster is a major PITA!!! Mine went dead while driving to the mall with my wife so I had to return home and drive my wife's Impala. I went to a shop and they replaced the unit with a remanufactured one that lasted about a year and a few days (as soon as the 1-year warranty expired).

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So, I bought a metal one from Midamerica motorworks:
I had a tough time installing it due to a back injury but finally finished the job. I then drove out to try it and at the first hard braking, something inside the booster broke with a loud "crack" and I was back to square one. Drove back home using both feet to press the brake pedal to make the car stop.
Removed the booster (damn the bolts holding it to the floorboard) and returned it for a no- hassle reimbursement.
The car sat until I managed to get one locally.
Midamerica also has the unit seen below but it costs $300.00 plus shipping.
Called a local Pep Boys store and they put a special order to their local supplier and in 3 days I had a remanufactured unit just like the one above for a mere $139.00 and a lifetime warranty.
It was installed by yours truly for over a year with no problems whatsoever.
By the way, my Vette is a 1987 Coupe but I guess it is a PITA in any year model.
A tip: when getting the firewall bolts out use a deep socket wrench (I forget the size) with a swivel joint and extensions with a ratchet. Then put some masking or electric tape inside the socket for a snug fit to the nuts so they won't fall while maneuvering under the dash. Believe me, those bolts fall and it is a PITA to get out of the car and find them.
Good luck.:cool