Originally Posted by 67gtolvr
I just joined this evening and thought I would offer this. I am the original owner of a '67 with manual drums ( how could they let this happen?). I am starting to restore the goat and found it (for me) very expensive to convert the system. Why not just add a power assist to the existing system? It seems like a much more economical way out.
By the way, what does matching numbers mean? My car has the orig. engine and auto. trans. What else could be matching?
You are lucky - I wish that I still had my highly optioned 68 GTO that I bought at Broad Street Pontiac in Newark NJ in 1968. I sold it for my first of many Corvettes in 1970. I loved that car but was lured away by a Corvette convertible. The GTO had power drum brakes. They were much better than my present car's non power drum brakes. It stopped pretty well but I do remeber a lot of brake fade.
Adding power assist does seem to make sense, but most catalogs that sell replacement power boosters do not recommend it. I do not know why. I'll research it via the GTOAA experts and via companies that sell the boosters.
Regarding numbers matching: In 1968 and later Pontiac stamped the last 8 digits of the VIN number on the front of the block and on the trans so for these later GTO's it is easy to verify it is the original engine and trans (that would be a numbers matching car). For earlier cars you need to be sure that the casing dates on the block, intake manifold, carburetor, etc are relatively close to the build date of the car (on the info tag that has the VIN, paint codes, plant of mfg, etc.) and the block casting ID (e.g. WT means 350hp with manual trans) matches the PHS build records. You can also replace missing original parts (tossed away when the car was serviced or traded in as cores) with parts that are have the right manufacturing dae (like I need to do for my missing Quadrajet carburetor).
You are in a very good position, being the original owner of a car with the original engine and trans you can prove have a numbers matching car with service records.
With a 1967 and earlier a person could "counterfit" a numbers matching car by finding an engine and trans with the correct casting dates. Ir sometimes thay maching away the incorrect number a re-stamp it with the "correct" number. Unfortunately, this is done a lot of times to counterfit Corvettes.