Cross fire FI was a dud from the factory. De computerized those and removed many of those OD transmissions that failed in under 70,000 miles and stuck TH 350 in their place.
I had 5 Datsun Z cars from the 240 to the 280ZX and I even built a manifold to bolt to the twin carbs on a 260Z to run an early carter AFB carb.
More power and more MPG same goes for my injected 280 cars.
With a cartech 4 barrel intake and another 4 barrel carb MPG went up as did the power.
The 700R4 trans in my 87 made it 115,000 or so miles then grenaded on me when I was on a date in 2004! Had it completely rebuilt, only reused the casing. I miss the days of $900 full trans rebuilds.