Little bit of a contradiction here....There's no tach to eliminate any confusion....If I understand this correctly...It should be a one wire preferably, 12 gauge from the junction block on the firewall to the HEI ??? Here's my issue to shed some light on this...The truck starts and runs on choke...To get any RPM the gas pedal needs to be pumped....then its spits & sputters...won't idle & quits...The carb has been taken apart twice & I'm 99.9% sure there are no plugged passages....There's good vacuum & the timing is set.....I also had the ignition switch out of the truck for a cyl & key replacement as the PO lost the key and was starting it with a screwdriver....Now another question why would a new ignition switch be any different in design? - wouldn't a replacement be the same????
