Lowered the mixture in both carbs to 2.5 turns clockwise each one.  Rear carb was adjusted to 3.5 turns clockwise and front carb to 4 turns clockwise. I have set the idle speed to 1000 rpm. Ill try tomorrow and report. This is how the plugs came out before i dialed both carbs to 2.5 turns:

Obviously, the plugs are still dark. Two questions. Did the plugs clean up well and is this all new fouling? How well did it run at 2 1/2 turns down?

Ill buy a new set of plugs and report instead of cleaning these ones. 

NGK bp5es or bp6es? Which ones?

I'd try BP6ESs.

I tried brand new set of bpr5es at 3 turns clockwise each carb. 2.5 was too sluggish for driving and engine not kept idling steady. Just took a spin around the neighborhood as it started to rain. No good results.  Plugs 5, 4 and 2.

Now that you seem to have good spark, you may want to consider backing up to the basics. Valve adjustment, timing, then mixture/balance. Not sure what fuel you have there, but our current 87 octane is garbage. My car runs way better on premium (non ethanol). 

Edited October 28, 20231 yr by emccallum

I have always usd 95 non ethanol.

Wish I could find that in my hometown.

Advance the timing more. Seems to be needing it.

10 minutes ago, gundee said:

Advance the timing more. Seems to be needing it.

I think its in 12 btdc. Ill check tomorrow.

Car runs good at 3.5 turns clockwise on both carbs. Timing advanced to 14bdc. Plugs BPR5ES from 6 to 1