[Andy]

Just my opinions. I would use the tractor lifters. I have had some and also the ones from Isky. They appeared identical. I did not use any of them. I had a set of original Johnson’s resurfaced. Some of the screws were a little loose. I found by switching lifters that I could make a good set. They worked fine. I never had to readjust them.
The sheet metal adjusting tools are worthless. I made a tool from some 1/8 music wire from a hobby shop. I cut an length about 6” long and bent into a V. I bent the ends down about 1/4”. It would fit into opposite lifter holes and fit under under the retainer. Worked great.