360 hesitation and

Post 12 edited
12s are the right plugs
Yes the back two. Just remove the link rod and put a spring on there or a wire and anchor such that the secondaries cannot open. Make careful note of the links orientation and then take it right out. If you changed the cam, installed new rings and gave it a valve job, then it's gonna be lean,and this is normal.

YR has a good point; you should check the power-timing. I know you said it's the same distributor, and it used to run fine. But check it anyway and limit the timing to 34* for now. Do that before monkeying with the carb.
Just disable the Vcan,and rev it up to 4000, and reset the D to 34*. Then observe only, the idle timing and report that here.