One question that a couple of us may have in addressing the gearing on Platinum vs Verde:
Since the gearbox and differential are separable... is it that the ratios in the differentials are identical, and the ratios in the gearbox are different?
I've overheard some chatter that racers are looking for an LSD differential, and also looking for a gearbox from a GTV6 with lower gearing. So they can get the best of both worlds.
On GTV6s, they changed those ratios almost every model year. From my experience, the 1983 models came with the highest gearing (better for top end, gas milage, and quiet ride). The 1984s had the lowest (when cruising on the interstate, you felt like you needed one more gear to shift into). But the '84s had better balls in pure acceleration.
So, that may answer some of your question. If the LSD diff is mated to a 1984 GTV gearbox... you may end up with your dream combo? Those with more expertise in this area are welcome to correct me, if I'm off target here.