Ok guys the crankshaft ,journals are all well within specs for the 0.010 under sized bearings so I will be polishing the journals and refreshing the bearings back to the same size. My mechanic buddy builds race engines and helped me Mic it all and said it was all fine normal wear. However when he looked at the timing chain he became very concerned as it had a lot of play in it. I will send pics. He told me to pull the head and look at the pistons and valves. So to my knowledge which is very little is that everything looks fine. There's a lot of carbon on top the pistons but no obvious abnormal wear. How ever as I started spraying cleaner on them and wiping away some carbon I noticed a stamped number on each one and it is 0.060 . My buddy is gone out of town now for awhile due to health reasons so I'm on my own from this point on. So any advice is greatly appreciated. I need to know is this the largest I should or can go? If not what should be done, and if so has anyone converted a 4.0l to carburetor and no computer? I really struggle with electrical and I'm having a difficult time with my daughter's 2000 G.Cherokee electrical system now. So in advance thanks.