car still diseling run on prob

I just put in colder plugs...yesterday but havent started it.. yes its a spark knock because my rockers sound like a sewing machine and this isnt that sound. I dont know what PV is in it yet.. When I get the timming down and re adjust the floats. Im going to go through the carb replacing things that need so. IT wasnt pinging before because it had 10psi of fuel pressure and was fluding but now with 7psi and 34-35 timming it is, so im going to lower timming to 32-34 and hope all goes well PS its 91 octane