your biggest and cheapest power gain would be weight loss.

my wife's stock wore out 22 re runs circles around my built 22 re with a 500 pound tool box full of crap in the back.

I took my tool box out and holy crap what a difference. it would light up the 36 inch swampers in first AND SECOND.
but out in the middle of no where I feel better having tools and spare parts.
mine, over sized valves, doa cam, bored 20 over, arp rod bolts. new oil, water pumps from toyota.. had it balanced and blue printed, line bored. header, redid the injectors, intake. new muffler and cat 2.25 inch. spent about 2800.00 on everything... not worth it.

a do over would be a fuel injected 302 or 351 Windsor ford motor with the t 5 manual transmission.
of course those 6 cylinder 4.3????? chevy motors are pretty good also.

but from everything that I have seen more power means more money and more broken parts. so bigger motor, bigger axles.. bigger trans...
after just a short while you are better off sticking your toyota body on a full sized truck with dual cases. like a one ton chevy, ford, dodge.. then it is no longer a toyota.
toyota's are so reliable in a big part to the lack of power from the motor.

really stock,, just look at the toyota world.
over sea's they load them down with 2 to 3000 pounds of stuff, out run people in the desert.. and they are shooting at them..
I saw a picture of a toyota with a fricking top.. the turret of a tank mounted on it. lol.. I would think that when you fired it, it would tip the truck over.
I am friends with several pro rock crawlers. twisted customs, riggins, jeepman, well riggins was there, we had just moved a 2000 pound rock as part of our trail maintenance,, (to save a tree).
and got into a talk, I said that I think the stock 85 toyota is the toughest, most capable 4x4 ever built.
stock now....
the only thing the group could come up with was a mercedes something that came stock with front and read lockers, big diesel motor, and portal axles.. not a cheap public 4x4.. not cheap like the toyota.

any one know the new, 1985 price for a all out toyota?? I would guess at around 8000.00.
look at the top gear movies, they could not kill the truck.

going to try to look it up now..

mine.

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my wife's

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