This might not be the best place to ask. The mini-pickups did not have the same engine as the Land Cruisers. Webers, out of the box, were never a great setup for the F series motors. But you have a different engine.
Make sure the people recommending the Weber have the same engine as you, or...
A good discussion on this topic below. I had one that I took the time to setup and it ran great. Took me awhile, but that’s probably me. 8 mpg, though, was one of the rubs (I’m 13-14 mpg with an OEM carb).
IIRC, according to the thread (WeberSarge) the reason people had good results on other...