Re: Stroker Kit wouldn't help?
To answer the original question regarding the availability of a stroker kit, yes, Morana has a 4.3L kit that IIRC gains 30HP at the crank and 30 ft lbs of torque.
I do not know any Ranger owner that has stroked either their SOHC or OHV engine. I also doubt there would be any increase in mpg with the kit installed, most likely a decrease.
My advice would be to do a V8 conversion as you'll be money ahead compared to the cost of stroking a 4.0L V6 plus the intake and exhaust mods to maximize performance gain.
What I can tell you from rebuilding/ modifying my 4.0L OHV top end, intake and exhaust was about a 32HP gain at the rear wheels and an increase of 1.5mpg. Cost was approx $1750 for parts. Bottom end remained stock. The rebuild was out of necessity rather than performance, the gains in HP and mileage were a bonus.
2000 XLT 4WD 4.0L OHV, 5 spd, Alabama Cylinder heads, Delta Cams Valve Train and Pushrods, JBA Headers, KKM Cone Air Cleaner, BBK Throttle body, Dynomax Cat-Back exhaust, Summit Racing drilled front rotors w/ EBC pads, Cobra rear disk brake conversion w/ Hawk pads, 8.8" 4.10 Traction-Lok