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If you still have your stock front suspension the travel hasn't changed, it's limited by the stops on the upper & lower control arms. No matter how much you lift it with the torsion bars the travel can't increase, so you don't need longer shocks for the front. Even if you go with shorter or even no bump stops the stock shocks should have enough overtravel to work. If you still want something longer a Ford half-ton pickup/Bronco from the '70s through the mid '90s uses the same style shock & often the exact same shock(at least for Troopers). Pick a brand of shock, see if there is a front shock that has a part number common to both Ford & Isuzu, there will be different part numbers for "X" inches of lift for the Ford, pick one as long as you think you need, just be careful they compress enough or you will break out the top shock mount- done that. My SAS LUV has run front shocks that fit a Ford pickup for years.
You can select a longer shock for the rear using a similar method, I think the rear shocks from an early GM half-ton fit, as will any shock with the proper size eye on each end, you just need to check the travel, I would have at least an inch or better two of both compression & extension past the maximum travel limits of your suspension. First though I would check to make sure you actually need a longer rear shock. I assume you added a leaf or longer shackles to lift the rear, & since the bottom shock mount is under the axle the shock starts off extended a bit farther than at stock ride height. The compression won't change, when the axle hits the bump stop the shock quits getting shorter at exactly the same spot as before the lift. Raise the rear of the truck until the suspension is fully extended, take the bottom of the shock loose & let it extend fully. Measure how much the shock mounting eye extends below the mounting bolt, if you have a couple of inches your shocks are long enough until you add more lift.
A too-short shock is better than one too long. Too short damages the shock while too long damages the shock and the mounts- you're only stopping the weight of the suspension or axle by overextending, you're stopping the weight of the vehicle by overcompressing.
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'78 Chevy LUV,1.9,4sp,headers,31's,SAS Dana 30,Dana 20,SOA rear w/Aussie Locker, rough body, bought new 12/4/78.
'87 Trooper,2.3,5sp,headers,31's,ball joint flip & spacer,Aussie Locker rear,Superwinch hubs,brush guard w/5.5K winch,more to come.
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I don't want to go with ranchos though, I have them on my 89 and they are definitely not worth the money in my opinion, they ride waaaay to stiff witch is something I don't need in my rickety luv. I had a suspicion that 1/2 ton chev shocks might work, I'll look for some and see what I can find. This helps a lot, thanks