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In general terms, about the same lift but less duration is what you are after. It reduces valve overlap, and raises dynamic compression ratio at the same time.
Isky Cams used to offer an off the shelf "Mile-a-more" series of camshafts for RV and towing use (V8 engines) back in the 1970's, they might offer a similar line of cams that cover your engine.
What you really need is an ols world "camshaft guru" like Dema Elgin to take an interest in your project. Guys like Dema have made a living understanding internal combustion engines, while experimenting with thousands of different grinds for various applications over the years. Dema has helped me with custom race cams over the years. He has also worked with road race and NASCAR teams too, yet runs a small 3 man shop and is a down to earth guy that I find easy to work with.
The process might be as simple as you filling out this questionare form and you sendiing in your cam to Dema in Redwood City, CA. Generally, if you are just reducing the lobe duration, they can just put a custom grind on your factory cam (or send in a 'core' from a wrecking yard engine so you can continue to drive your Jeep for now). But I never tell my cam grinder what to do, I tell him what I am trying to do and let him prescribe the remedy. I would also call Web Cam and see if they might be interested in helping you out.
Dema Elgin Cams (650) 364-2187
Web Cam (951) 369-5144
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