ouch, i am sorry hear about all the problems but i fully believe you will get through it.
as far as the mirrors a cheap set of extensions and some round bubble mirrors can help. they are not very stylish but help. i have a set of these from my old mirrors, i am not sure they would fit your mirror style but they are yours if you want them.
https://www.amazon.com/****-11500-Custom-Towing-Mirrors/dp/B00069D55M
i know when i was running the fan clutch on my idi it would not kick in until 215 to 220. i knew it was kicking in though, i could hear the roar of the fan in the cab going down the highway and it worked. i can't find it right now but Elijah mentioned that you can drill out the fan clutches and add some fluid to get them to engage sooner.
that's one of the reasons why i pulled my engine. even if i kept the EGT's under control the water temps would eventually get me on the hills. you have a mush stronger cleaner and fresh set up. (i did find out my old engine had some broken valve springs) i would be looking close for some boost leaks after you get it timed. you should be able to get much better than 5psi.
its no red head but my advanced auto steering box is still tight and working well after about 4 years. i needed one quickly in a pinch and they had one on the shelf.