i have a 1970 g20 sports van that got great mpg for the previous owner,stayed at 3/4 of a tank until it ran out of gas. he also overheated the engine so he sold it to me for 600 bucks. i replaced everything in the engine except the camshaft and rings,i'll probably change those later. dropped the tank and found rust and a frozen sending unit. got the rust out but haven't been able to find a sending unit. what will interchange. i also need a dash because someone tore up the old dash to get the 20 dollar radio out. some peoples kids just never got whooped enough.