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'Make damn sure your sparks are right before you start messing around with the fuel'. Butch Bohunk, Master Mechanic, Finzio's Sincair Service

My vote is that electronic distributer. Do you have an old points style one you could swap back to ?

SX

Maybe try one of these cheap plug testers. At least you could visibly see spark getting to the plug and rule out ignition. What do the plugs look like? https://www.harborfreight.com/90-in-line-spark-checker-63593.html?hftm_sc=532&hftm_source=google&utm_source=google&utm_medium=cpc&utm_campaign=21901271210&campaignid=21901271210&utm_content=171677806542&adsetid=171677806542&product=63593&gad_source=1&gad_campaignid=21901271210&gbraid=0AAAAADAHb4cCWCcSJ4qCMytUVmlv7v7bX&gclid=CjwKCAiAlMHIBhAcEiwAZhZBUlzpLzH9TR7YSC9i3f7bzmYEm7gw-Ai3uRRfne-Qjhh-zYy0O4G-khoCpwwQAvD_BwE

Disconnect at the manifold/header exit and run your borescope up that way. That distributor looks like just a magnetic pickup distributor, that uses an external ignition module. But your exhaust blockage sounds reasonable. Good luck. Post pictures.

Your compression test would seem to rule out anything mechanical in cylinders one and two. And yes, front carb supplies all three front cylinders, so I would not suspect a "no fuel" issue. How confident are you that the carbs idle settings for the carbs are where they should be - so both carbs flow the same amount at idle? And, when revving? Spark plugs can be dead right out of the box. I'd move plugs around and move plug leads around with them. I'd try swapping known good, perhaps from six to one and from four to two and vice versa. I think a Z engine will have a very hard time running if it has two totally dead cylinders. They may be intermittently firing a bit. So, new plug wires, new plugs, and new distributor cap?

Hi guys, this week i sold my 240z! It needed a good service as the engine leaked some oil, the body needed some work and.. i don't have the energy to work on it i will now concentrate on the engineroom of the 280zx i had restored in the past years.. I kept my self made mahogany steeringwheel and gave the new owner the rear wheel arches that i had stored on my attic with the car and some other nice parts to make an nice driver car for every day. As you can see in this pic the car has glassfiber rear arches and they are not original. As i said, i will now with some help of a friend, going to work on my almost ready 280zx! He also helped to get the lighting ready in my carport as he is a electrician as i am also! I finished also the air to air heat pump in my garage, so we can work on the 280zx coming winter. It was a bit difficult to let the 240z go but i had it for 27 years, and drove it for 25 years! It was a blast!