1988 4.0 block stroker build

[brokejeep]

I am new to the forum, thanks in advance for the advice.
I am building a jeep scrambler and it is time to find a motor. I have found a couple motors for sale locally that I am wanting to purchase and hopefully turn into a stroker. The first is a 1988 4.0 that has been bored .30 over and was rebuilt 5000 miles ago then was removed to make way for a V8. The second motor is a 258 out of a198? wrangler that has been converted to a 4.0 head and fuel injection. My question is what would be involved in swapping the 258 crank and rods into the 1988 4.0 block??? I also have a 7120 head that I can have worked and put that on the 88 4.0 block. A concern I have is I have heard the early 4.0 blocks are not as strong and can warp??? The 258 with the 4.0 head comes with a hesco harness and dampner cps.
I can run the 258 with the 4.0 head swap then build a stroker on the side or build the stroker I just need to know what is the best route and any and all advice would be helpful.

[gradon]

It's actually claimed that the earlier 4.0 blocks had a higher nickel content and possibly thicker cylinder walls. The 96+NVH blocks had thicker webbing. I'd be skeptical if someone spent money rebuilding an engine only to take it out 5000 miles later. Yes 4.2 crank and rods can be used in a 4.0 block to make a 4.5+ stroker engine.