I had a stock 305 TBI but after droping a 350 in Ive made my way to the fuel system I have a fuel injection setup to plumb for but I was just gonna use the stock supply and return lines because they seem adequate, I need to know the fitting thread size on the fittings in the engine bay and the supply fuel filter fittings. any help would be great because I cant seem to find anything.

 

I know the line sizes on the hard lines from the frame to the TBI. They are 14mm on the Return and 16mm on the supply line. Earl's Performance AN to Metric Adapter Fittings: EAR-991955ERL - summitracing.com that particular fitting will fit the supply on both the throttle body and the soft rubber line coming from the frame and a 14mm will fit the smaller return line. I'm not sure about the fuel filter fittings though.