hi, i have a 71 lark originally with 350. converting over to 455. the original gas tank had just one line on the sending unit. it goes up to the fuel pump. the vent line for the canister goes up to the manifold vent behind the seat behind the gas tank. the 455 has the 3 line one from tank, one for vent, one for carb. question is block off the return line and get the single sending unit or get the double and run the vent line up. non a/c car. if its run the vent line can it be hose all the way back or must be steel line. thanks
