This 1/4NPT male to 1/8NPT female reducer bush is a must have item if you're fitting a liquid-filled fuel pressure gauge (which typically comes with a 1/8NPT thread) to your 1/4NPT fuel block port.
Part No. 9179K
5/16 inch OD hard fuel line can be used on your 97 or BIG97, BUT you need the right Ford nut compression fitting ( 9581K-BIG ) and the 9564K-BIG Stromberg S-jet inlet valve. BIG97s already have the BIG S-jet. Read on!