I brought up the thing about the e10 crap fuel they are selling nowdays because I have been doing nothing but rebuilding/cleaning out power eq. carbs all spring. The ethanol picks up the water and crap in your tank, and is corrosive to some parts including some rubber. Lots of info out there on it, even on my 67 I ended up having to put a fuel pressure regulator set at about 6 to stop the needle/seat from getting stuck and I use non ethanol fuel. I too have had a new filter clog real quick and send water to the carb, start with the simple stuff perhaps swap a know good carb on there to rule out that as a potential problem.