Fuel consumpsion depends on your right foot!!! But years ago I fitted a 350 Holley and manifold on X-flo and fuel consumption went down heaps for I didn't have to kick it down much got heaps of acceleration in the higher ratio [c4 auto]. Alot depends on how its set up, make sure you have adjustable linkages between carbs or spring and screw like Webers sidedroughts..
Deff. need good exhaust to make any difference.
Don't be afraid to try something new. Remember, amateurs built the Ark...Professionals built the Titanic!
Tuned & maintained by "Peppertree Perfmormance". Dart block, Scat 4340 steel crank, Custom C.P pistons.Oliver rods.. Mal Wood twin plate clutch.. Twin SC61/2's,482 rwkw/ 645 rwhp..
Passengers, myocardial infarction material..