Got a 327 with GJ 4 barrall. Sometimes it idils slow, sometimes high. Sometimes motor run good, sometimes not good. No vacum leaks. Has headers, Old heads with the 13/16 plugs. Oil spoct on intake. a 1968 motor. 400 auto transmission C-10 truck. Only had it two weeks. Have put about 300 miles on it. Have put another carberater on it. Seens to do the same thing. Some wetnesss comming out for intake, not gas. maybe a little water with some oil, not sure. new gas filter, but rust in line. Runs cool , good oil pressure. Some times it seens like it wants to backfire. Have heard a funny sound at exhast. blows out water when it cranks. Want to keep it going until summer, Then will rebuild. John.