I'm (was) running 18 on a bone stock 83 318. you might do the "vac gauge method" & see what that gets you for what it wants for initial. No way would I think 12 would be better than 16 even WO a cam & with it even more reason to bump it up. At least see what the VGM comes up with & try both ways if desired & tune for both (idle speed back to your lowest reasonable hot idle speed along with mixture screws) & see which acts the best then change the slot choice in the plate then springs then adj the can.


live every 24 hour block of time like it's your last day on earth