I suppose you know a Quantum with a 34" scale is a 26 fret model and quite novel? I do not remember if there are models from the 80's that are Quantum AND 34"? During 90's everything in the Q SPi range was 35".
(TBX may have been whatever, because as its name states: through body experimental, but I do not consider that they belong to the family of bolt-on Qs.)