my 83 fj has very low compression a round 110 -140 runs but weak i]d check exhaust heat riser ..... one good back fire can kill a brand new cat .. mufler etc.
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Get your OEM parts from Cruiserdan on this forum (Toyota parts guy) - has great prices.
I'd do some diagnostics before I pulled the head - it's a bag o worms. Charge up the battery, pull the coil wire, & have someone else crank it while you do a compression test. If possible, borrow the equipment to do a leak-down: it'll tell you whether rings or valves, & which valves.
thanks for the heat riser pics, what does the back side look like(sided without spring)? Mine backed off and flopped over inside, just want to know what hardware is missing and in need of replacement. If this doesnt work, I'll continue on... air quality is getting better here as the fires arent raging as bad. So if this aint the fix, i'll be back to peddling until i can fix it.