a 1400cc engine shouldnt be that bad on fuel worked or stock.yes if u drove around full throttle everywhere its going burn fuel but if its well tuned and u drive it normally it be fine,it all in the tune mate a14 and webbers is a must u will never look back nice cam is needed for it all to work but.
having no datsuns is a good thing,now u have room in the driveway for another one.id have more datsuns if my backyard didnt resemble a small wrecking yard.
yeah the old owner would more than likely have something to do with it,you have to be careful what u say and who u accuse though cause people get shot over this #OOPS#.