After finishing up my 1970 M49, when I turned on the gas, I get a leak from the top of the banjo fuel filter (white area). In the parts book looks like there is no gasket between that and the float bowl , just the filter. I already replace the the o-rings and bowl gasket so I'm guessing I need a new filter/and or a float needle? It still has the original plastic needle in it. One last thing, would a NGK B6ES (.021 gap) plug be the right one to use? Thanks