Just saying, Use the 4.0 pistons and the 4.2's rods and crank is an easy 500cc's more with no over bore. The 4.0 has a bigger bore but shorter stroke than the 4.2... A 0.060" over bore is a 4.7L
I know, there are tons of Jeeps around here with stroker motors, thing is I don't want the powerband to fall off a cliff after 3500 RPM and because we have emissions testing here I'm very limited in camshaft choices, also don't feel like trying to port the head beyond the usual cleanup. The stock 4.0 had more than enough torque to pull my Jeep up super steep inclines in low-range and driving on the street I could take off from a stop without touching the gas pedal if I wanted to. Gobs of grunt from idle to 4000 RPM.
Living at high elevation I'd rather keep the low-end torque the way it is and have a turbocharger with maybe 8-10 psi boost to give the extra power when driving on the highway up the mountains or just ripping around on the street having fun. ~300+ HP in a 3000-lb 4x4 SUV is a lot lol. Off-road you really don't need much power at all, it's all about the gearing from my experience. 4.0's love boost, much like a slant-6 they take to it very well and even in stock form hold up for a long time as long as the boost doesn't get cranked up super high and the tune is good. Yes it'll be more work than building a stroker engine but at this altitude forced induction engines sh** all over anything naturally aspirated unless it's got mega cubes and compression. The 360 in my Duster would make over 350 HP at the wheels at sea level but up here at about 5300' it put down 286 uncorrected.
