Crankshaft replacement

Cherokee Sport 4.0L i6. I have had a low oil pressure problem when vehicle is up to running temperature. PSI eventually drops to zero when idling after engine is at running temperature. My vehicle overheated a couple years back. The radiator/cooling system was replaced. Shortly thereafter came these problems with oil pressure. Eventually I discovered a crack in the 0331 tuppy head between cylinders 3 and 4. I have most recently replaced the cracked head with a brand new head from clear-water, but before the crack was discovered, the oil pump was replaced following the replacement of the oil sending unit. Now after all of that, we disassembled the lower engine to inspect crankshaft bearings. Thus far this is the result using SPG-1(green) for 0.001" TO 0.003" plastic gauge.

Connecting rod clearances(1-6)
[+/-.00001" for error]
1-less than or equal to 0.00175"
2- less than or equal to 0.002"
3-less than or equal to 0.00175"
4-less than or equal to 0.00175"
5-less than or equal to 0.002"
6-less than or equal to 0.002"

Main bearings(not fully completed)

1-
2-
3-
4-
5-
6- 0.00175" [(+/-) 0.00001" for error]

So I am wondering what the desired clearances should be along with the torque specs. Additionally, any suggestions or advice would be much appreciated, preferably from someone that has experienced this issue with the 2001 Cherokee Sport 4.0 i6. There has been a lot of forums with other people in my same situation. I hope to find the definite problem and equally importantly, the solution. Hopefully to minimize the chances someone else will have to deal with all of this issue.
Thank you,
Greg