The adjusting bolt you are pointing at on your pump just hits arm #2 that controls the metering valve #4 (both in first pic). If any pump repair shop is using this to set the total horse power on an injestion pump then they are doing a poor rigged up job. This is to set the torque response of the pump. It will not give you more total fuel delivery unless someone has set the injection pump wrong internally.
To correctly adjust the maximum fuel delivery you need to tighten bolt( second picture) #12. That spreads the retaining clamp #13 open. This lets the pistons #11 travel out into the cam ring further. This gets you a higher maximum fuel delivery.
The adjustment bolt you are pointing at does not change the maximum fuel delivery. It just changes when the pump will allow the maximum fuel delivery. You will not gain much horse power and you will make it smoke like a freight train.
I have set them on a dynometer where you can actually see the horse power not just guess because it is smoking more.
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Today's Featured Article - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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