I've been having problems with my Proform 850 racing (no choke) series carb. Its been on the car for about 7 years but only has about 1500 miles on it. I've had some issues a few months ago and got all but one problem fixed. Fuel discharges from the secondary boosters when fuel pressure is applied. When I take the bowl off and apply air pressure and manually lift the float the air stops. Valve and seat look good. I'm going to assume float level is still good. Its never been adjusted. I know I should assume nothing but with fuel pressure applied when carb is on the engine gas is just being pumped into the manifold and into the engine. Should I just replace the needle and seat assembly anyway?