59 235 newly rebuilt, has fentons, offy, duel rochesters(new rebuilds), pertronix, and 1950 flywheel,otherwise all stock. I have made these upgrades with all the helpfull info found on this site. moter has run great with 18 pds vac at 700 rpm idle.recently started preignition when shutting down, and now is very hard to start.when i finally get it going, can not go below 950-1000 rpm without dying. checked timing, choke, and checked for vaccum leaks with propane.came up with nothing.in the process of this, problems getting worse.motor races and overheats(new radiator,hoses,thermostat,cap) the only thing i found was the distributor seems to wobble, but timming mark doesnt fluctuate.please help with any info.thanks
