You have to clean out all that gunk from the oil lines.
All of it. It's in the external oil pipes too, and all inside the banjo bolts and banjo housings, and in the quill bolt and all the internal passages.
Get some long pipe cleaners and some mineral spirits and start to work. If there are any passages which cannot be cleaned out with pipe cleaners, mineral spirits and compressed air, then you can use a properly-sized long drill bit or rod to push down the holes to clear them. You don't need to drill anything, just use it as a clearing rod.
If you install new oil pumps, you MUST be sure that they seal and are not binding during rotation. It's common that they bind, or don't seal, and need fitting/lapping. Use the lighter-pressure oil pump springs, because they work better and the old bikes still have the stiff springs.
Get a new worm nut with the bonded neoprene seal. You probably already have that in there, but they don't last forever. It is an important seal, and it's not a lot of money to replace that worm nut with the seal bonded in.
In case you don't know, that worm nut and the nut behind it are left-hand threads, so they turn the opposite way than normal. And you can down-rate the torque on them, because they won't unscrew, and the factory torque spec is too high for those things. 20 ft-lbs is plenty enough for those.