if you have a decent machinist and the plan to build an engine I'd go stroker. Get a decent 4.0 block and the HO head and use your 4.2 crank/rods. If you stay carb so be it, but efi would bring benefit with the work. I just bought another xj with blown engine and sourced a 4.2 rotating assembly. I'm about 2k into the whole setup and its a decent bump of fun with a little more displacement and a cam. I thought of stock 4.0 again, but for the extra 500 for crank and cam( since machine work was a given) it was totally worth the dollar. Also a tech at a local shop so resources for parts were easy. Happy building!
84 xj 350tbi, sm465, 203/205, 60/70. links and other junk.
what size sawzall blades does it take to fit 40's?