For my BJ70 I had my rad dipped/recored at a shop doing mainly truck radiator repairs about 6 years ago. Was about $550 CAD at the time, likely more now. Replaced the water pump and hoses at the same time and my cooling system has been working great.
I replaced my stock and extremely worn out suspension a year ago with the Old Man Emu kit. As mentioned that’s what it looks like you have. I’d leave it. No one makes aftermarket springs with <2” lift and finding originals to swap means 30+ year old parts.
31x10.5 are a good tire size for the...
If it's the original primer pump, I'd replace with an aftermarket Bosch one. Mine leaked, though the truck ran fine. They are like $40 and are a really easy swap.
I've ordered from Discount OEM Toyota Parts and Accessories - ToyotaPartsDirect.com - https://www.toyotapartsdirect.ca/ in Canada and Genuine Japanese Car Part Imports - Amayama - https://www.amayama.com/en and PartSouq Auto Parts Around the World - https://partsouq.com/ internationally...
Check out Terrain Tamer - they sell aftermarket bushings for the BJ70 and I believe there are a few North American distributers. Bushings are on my todo list for my BJ70. Terrain Tamer - Body Mounts - https://www.terraintamer.com/4wd-products/body-parts/body-mounts
I see you're in Dartmouth, me...
Here's my BJ70 with OME lift and 31x10.5x15 tires. Not the best picture, and I think 33s would fill out the wheel wells a lot better, but I like how the 31s drive. I was worried about anything larger and stock (3.7) gearing.
I think cost was a big reason they did not sell well in Canada. I read somewhere that in the mid/late 80's in you could get a BJ70 for something like $12-13k, while a CJ started at 7 or 8k. That's a huge difference!