I've got 50's in my 85 GN...TA-51 w/PTE exh housing, one-off TH DP, CAS V2 FMIC, JL 92 street chip, MM MAF Trans and IMP SS MAF, etc...On 16# boost and 92 oct pump gas, I dyno'd 330hp/440tq with a MM 208/208 cam(#3 cam lobe wiped, was probably half-gone at the time of dyno)...Don't remember exact times, but was around 13.5 @ 104 with a 2.6 60'...Helluva time spooling up to boost, had IC hose leaks and some other issues...Times run were with the same setup as the dyno run...Had 13k miles on it when I parked it due to severe lifter ticking...I've got a CC206/206 going in now, hopefully be running soon...Need to do some minor re-engineering of my setup, mainly idiot proofing the IC hoses, and fixing the other minor issues...
On a side note, with the above setup at about 800 miles on it, I drove it to BG last year(2001) for the NATS and managed to get 27 mpg...