[The Yeti]

Back to basics

Is the vacuum advance working? And are you getting vacuum to the advance?
You say your plug leads are new? But just check the resistance (should be between 4,000 - 6,000 ohms per foot (30cm)

Silly question but when you threw the plugs in did you check the gap? Or use the factory set Gap? From memory I think they are fairly close at about 0.8 but you’ll need to check as the last time I worked on a cross flow six the year started with 199

Also check your point gap I won’t even Hazard a guess on that as I used to do them by eye