As I recall, Gassers typically had a mild lift up front to aid weight transfer rearward, for better traction off the line. I can't say how well it worked but a lot of drag racers did it back in the day, so draw your own conclusions. Less clear is how well it transferred to street use. Speaking of that -- I knew a kid back in the mid-sixties who owned a highly modified street-driven '55 Chevy. It had that Gasser stance, straight front axle, and a bored & built 409 with two 4-barrel carbs. Said he got 3 mpg (!) which was unacceptable even with gas at 2 bits a gallon. He swapped the twin carbs for a single and said his mileage doubled..... to 6 mpg. Ah, the good old days!
EDIT: I wrote this before seeing the 2 posts above.... but I'll leave it the way I wrote it.