Use the extended tip type plugs like R45S or R44S. You probably need to look at the carb too. It probably has a Roch. model B carb which is notorious for running rich if not working right. To me its not as bad of a carb like some of the criticism it gets. There are lots of advise on how to repair it on this website.
George

Last edited by Wrenchbender Ret.; 05/27/2021 4:13 PM.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.
1972 Chevy c10 Cheyenne Super
In the Gallery Forum