Re: sluggish 302
If it was me, i would just go some simple bolt ons you can use later when your fed up with the lack of go and get a 351. Things like inlet manifold, exhaust, up the rear end ratio if its a 2.77 or similar. If the ZJ has the 4 barrel thermoquad carb i would keep that cause on gas mine went worse with the holley. If your wanting a decent upgrade you would need to put in a bigger cam.
302 Cleveland flat tops, 600 holley, single plane manifold, crow cam kit (214/224 @ .05), stock 2V heads, extractors, twin exhaust, 9" 3.25 lsd, stage 2 c10, 3000 stall.
15.2 @ 89 mph