Well where do i start? depending on how rough you are the cheapest way to lower any car is to take to the springs with a grinder, hack a couple of coils off and there you go!! rear- buy or make some lowering blocks most performance stores sell them. What sort of carby did you have on it before? Because i say this to everyone, the best thing i ever did was throw away that ####ty hitachi carby and put a 32/36 webber on, i have never had any major problems only with the one that i have on my ute at the moment and that is only because i bought it from a wreakers,i'm always sus on things bought at wreakers because you don't know for sure what sort of life its had before you spend your hard earned dollars. fuel economy is like any car- depending on how heavy you left boot is, if you like constantly wringing your 1200's neck(like me

)you'll probably use a fair bit of fuel, but if you drive like an old grandpa you should'nt be on the road!!!

all depends on how much you drive it and the distance covered. Is this any help???
P.S- i think my mates are right!,i get a bit carried away when it comes to datos! WHO CAN BLAME ME!?