I have a 2" and would not go any more than that IMHO.
To my best recollection this is the mods I made.
Had to drop rad and shroud 2". Dropping the shroud alone still let the fan hit the lower outlet on the rad.
Had to knock the plastic pin out of the steering column so that it would extend farther.
The clutch linkage still worked w/ some minor bending and adjustment.
Had to inlarge the hole in the firewall (down) for the clutchrod off the pedal.
Had to inlarge the hole in the "hump" for the shifters. Since you are farther up on the levers.....they move "farther".
Had to lengthen a few wires here and there. My fuel filler hose JUST BARELY streched far enough.
And then I made covers in the rear fenderwells to hide the GAP.
My nerfs hide the sides. And bumpers hide the rest.
I think the big gaps are UGLY.
I don't think you can hide a 3" very well.
And as stated 3's are really hard on the mounts.
hope this helps.
Lead , follow , or WINCH ME OUT!!!!