Being that the partial choke does not improve the condition, I am inclined to think it's an ignition problem.
Some things to check:
Worn distributor bushing causing the points to not remain set correctly. They can do some strange things, vary with RPM, temperature, etc.
Distributor cap and rotor. Have you checked the spark at the plugs? Could be loss through bad wires, rotor/cap connection, rotor or cap carbon tracked or rotor burned through.
Bad ignition switch or loose/corroded/mouse chewed/pinched/burned wire causing loss of power to the coil. Try temporarily connecting a volt meter from the + terminal on the coil to ground. Run it until the problem occurs and see if there is a voltage drop.
The quality of today's points and condensers is sometimes questionable. If there is some distributor shaft wear, or you suspect there may be a problem with the points, an electronic conversion can solve a lot of problems.
Other things to check not related to ignition problems:
Take a look at the valve train. Check the valve lash, look for a broken valve spring, sticking valve, dropped seat, bent push rod.
Is there any smoke when it misfires? Black smoke would indicate flooding carb, restricted air. White smoke, raw gas, eye burning smoke would indicate unburned fuel from lack of spark or loss of compression.
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Today's Featured Article - History of the Nuffield Tractor: Part 2 - by Anthony West. In February 1953 production of the ETC T.V.O engine started, ready for the March 1953 press announcements. The new TVO engine had a number of improvements which resulted in a 10 per cent more power (43bhp as against 38 bhp on the earlier engine) and 10 per cent more fuel economy. Some of the improvements are listed below: Redesigned combustion chamber, improved spark plugs and positioning, plug size 14mm(earlier size 18mm).
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