If you don't have a trustworthy local shop, and can afford for the truck to be down, I'd contact ZUK
www.gearinstalls.com
As far as solid spacers go- the pinion position is determined by a spacer. Normally, it's a crush sleeve that collapses when the pinion nut is tightened. The spacing determines the interface of the pinion gear to the ring gear (simple version). Zuk's site can explain in much more detail what the relation is. The issue with a crush sleeve is once the crush has occurred, any further tightening of the pinion nut, such as removing the nut to replace a leaking rear pinion seal, crushes the sleeve further and changes the preload on the pinion bearings, the backlash between the gears, and the gear pattern between the two gears. Also, it's said that impacts to the rear end can jar the crush sleeve causing gradual loosening.
The solid spacer is machined to a particular overall length, just shy of the needed length which varies between gear ratios, manufacturers and gear sets. The additional space is taken up by shims so that when the gears are set up, there is nothing to give. It makes for as rigid a set up of the pinion position as possible. Set up takes a bit longer, but it's stronger, and if the pinion nut is removed and replaced, there is almost no movement of the pinion, regardless of torque applied.
check out zuk's site in detail (you could spend an hour reading the different set ups he's done and he give a lot of info about the solid spacers there).
As far as gear makers,Yukon is what I used and were highly recommended. Nitro has a following as well. Again, Zuk can tell you what to stay away from. Since it's a one time thing you'll expect to use daily for the next few decades, don't skimp on low quality.
when I priced gear installs, I was given a price of around $1800 parts and labor by a local TLC shop. I found a 4x4 shop that said they'd do it for $500 plus parts, which amounts to $1300 total. I ended up spending another $750 fixing the damage they did. Long story but they didn't tighten anything up right and their work ruined my spindles, and I ended up having to replace pinion bearings and add more spacers to my solid spacers. I learned how to set up diffs, so it was an expensive lesson, but not without learning.
hot links
http://www.justdifferentials.com/index.php?main_page=product_info&cPath=385&products_id=3662
I think the link below is right. If you go with solids, check before ordering. They don't list as for the 80, but
http://www.metaltech4x4.com/p-181-toyota-8-v6-high-pinion-e-locker-solid-pinion-spacer-hilux.aspx
From Zuk, showing a solid spacer vs. crush sleeve
http://gearinstalls.com/eric.htm
http://gearinstalls.com/