First of all, this post is coming from someone with a 2 GPM well. I've done a LOT of research on wells, but focused on areas more like ours, with a normally-high water table.
The way to rate a well is to pump out a measured amount of water and then calculate the capacity of the well. In your instance, you ran a 35 GPM pump for 8 mins 6 secs after the well having 24 hours to recharge. In my opinion, that well is not working. Water is not able to flow into the well.
You "may" be able to improve that, but with this being an old well, we have no way of knowing if maybe the well was abandoned at some point and someone put a little concrete down it.
Without knowing your soil conditions (surface and below-ground), I cannot say what the best 'fix' might be for restoring the well. Sometimes high-pressure air is blown into wells to "unclog" tiny particles that have, over time, blocked the holes coming into the well. Some people use a blast, such as from a gun. I've never done anything like that so don't look to me for advice there.
You could try blowing your well with air if you have access to an air tank with a dump valve - kinda like those used to set tire beads. Wait a while and then try the well again.
As mentioned, we also don't know if water is able to permeate through a screen portion of the lower casing, or if the only access for the water is the bottom hole. If it were me, I'd try to research that well and see if I could find that information. Two sources that come to mind are 1. the land abstract and 2. the county records concerning wells.Your state may also keep such records. You may be able to find out who dug the well also.
Just went back to your original post. You wrote,
"We have a 50 year old well that has never been used. They tested it and it was high in nitrates so it didn't get used. I need help on how to set it up, pump type and pipe.
Checked it today. It is 169 feet deep, only 18 feet to the water level, and has 8 inch ID steel casing that is cut flush with the ground and cemented in."
If the well was abandoned by the well drillers, then the well would have been sealed. That would explain the extremely low capacity of the well. I'm guessing they dropped concrete down the well to seal it, but concrete is porous and can allow moisture to permeate through. In my opinion, the ONLY way you're going to get that well going again is to break that concrete.
The method I would try is to find a long, heavy chunk of steel with no sharp edges that could damage the casing, attach a long rope, and repeatedly drop the weight down the well to break up the seal. This would work better if the water were pumped out prior to dropping, but may work with the water there. This is the same method used by people drilling their own well in arid, rocky areas (see link to video). Keep in mind, if this well was sealed by the well driller and is listed by the county as sealed, you may be breaking laws if you attempt to break that seal. You could either talk to your county agent that handles wells and ask permission (if allowed, there would likely be permits, fees and testing involved), or you could just do it and take your chances.
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