If all 8 plugs look like the one in the picture, then you’ve got a set of fouled spark plugs. The blue smoke seems to point to
oil fouling, but could be fuel too. Not going to run right until you either clean them or replace them. Are you sure they’re the right heat range for your engine?
It’s rare to see all 8
oil fouled at the same time because of a head gasket or intake gasket leak. rarely do both head gaskets or intake gaskets leak into all eight cylinders.
Those plugs will never run right in the shape they’re in. Replace them and then go for a ride.
You indicate that the engine runs better after two or three acceleration runs. That indicates that the combustion is trying to clean up the fouled plugs.
Have you noticed a decrease in your mileage recently?
Do you have an automatic choke on the carb? Is it fully open?
Do you only run a few miles each time you drive or do you get it up to temp and let it stretch it’s legs?
My suggestion is to replace the plugs and take it out on a twenty mile drive. Get it good and hot. Not stop and go driving. Freeway or mountain roads. Let it run and see if the problem goes away. Hard to diagnose if the
oil is being consumed or leaking out if there is lots of oil on your floor.