69 bee 383 4bbl. The engine runs rich at idle to the point your eyes hurt if you stand behind it. Idle timing set about 8 before, rpm about 800 rpm vacuum is 5 inch.
I cup my hand over the carb the idle goes up and vacuum goes up. That tells me vacuum leak. I sprayed brake clean at base of carb little change in rpm. Spray aroud intake gasket at heat cross over big change. I look online and saw valley pan with and with out fiber gasket. I did not put fiber gasket on. Do I need fiber gasket?