400 7fb jwac 3406b cat problem after rebuild

Well something has went wrong some where. I have a 7fb12885 400hp cat jwac 3406b in a 84 Pete 359, that I just rebuilt myself. I've been turning wrenches since I was old enough to tell the difference between a wrench and a socket, so I felt pretty comfortable in rebuilding my engine. After completing rebuild truck fired and ran good sitting, except a little white smoke which I was throwing off as fuel problem do to fuel lines not seating. Got them seated up,and let the engine run til temp a couple of times, never at anything lower then 1200rpm, took it on a test run bobtail with about 30mins or so on the engine to start the ring break in and for a small test before putting a load on it. All was well plenty of power untill I get to the first hill a mile from the house and as soon as it starts the incline it fell on its face, barely made it to the top of the hill. As soon as it leveled out it stalled like out of fuel but started right back up like it ran out of fuel and was running smoothly again with what seemed like plenty of power going back down the hill and on level ground, but was now smoking white bad. Got it back to the house raised the hood still running very smoothly and coolant over flow tube was literally humming with air from coolant system. Hurried up and shut off truck. Oil level still good, coolant level a little low, and no leaks that I can see. Went to do research and the next day start to look it over and crank it up and cranked about half a crank and felt like hydro lock. With being upset I didn't look at her for 3 days, decided to try again just for kicks and she cranked over fine for about 2 cranks like nothing was wrong and then seemed like it hydro locked again. Sorry for the long post just trying to give as much info as possible. Any ideals?

 

Oh forgot to mention that there was no coolant leaks or smoke before engine teardown, reason for rebuild was knocking and oil out exhaust, which ended up being #5 piston and rings, intake lifter on #6 was deformed, and bearings were showing there age, those were the major things the rest was just finding seals that had hardened. But like I said before engine teardown it never smoked white, just normal black when shifting and never lost a drip of coolant

 

I.know this ain't going to be the best answer, but as far as liner protrusion, there wasn't any signs of problems before and once liners were be removed there wasn't any pitting or anything like that so I just cleaned with a cheap of brand stainless steel wire wheel that would wear out before it would score the block and same with head and spacer plate, everything was almost as a polished surface when reassembled, I did one liner at a time and measured each one as I went, not with a micrometer though

 

Old head, and I was kinda thinking jwac to but haven't had a chance to check it out yet. I figure when I get back home I was going to start either there or pulling the nozels out and with a tube and pump out coolant in pistons and see which one or if all pistons have coolant. If all of them have coolant then I'm thinking it would lead to the jwac, right? But then I think that at 1200rpm idle is the turbo pushing enough pressure to overcome the coolant pressure enough to escape from radiator over by flow tube? I don't know I've never worked with a jwac before.

 

But from my research I found a post that said something about a jwac causing some problem at an incline but not so much on level, which I am experiencing