Big cam troubles

I have bought a big cam 3 (625 cpl) with a cracked block (I'm assuming bad heads etc, it only had water in it when I bought the truck), but appears to run well, only leaks when it gets warmed up and all that, so as of now I believe the cam, injectors (which I'll have rebuilt anyway), aftercooler, pt pump, etc, etc is still good...and I currently have a good nt88 block, does anyone know as long as I switch to the new style heads and rockers if I will have any trouble building a 625 cpl, low flow nt88...im not seeing any reasons atm why it wouldn't work, if anybody can tell me for sure it will work or has any reasons why it wouldnt id sure appreciate the advice before I dump time and money into the project...thanks in advance fellas

 

Hmm, I hate to hear that, but glad I found out before I got it put together lol...thanks man

 

I can tell you for a fact all the stuff will bolt up, and oil passages, will line up...as far as I can tell the nt88 does cool different as I found out by an earlier experiment done with an nt88 head on a small cam, that I never could get to cool (I had parts and in my early days I didn't know there was a difference), I just don't know if the low flow cooling system will keep up with 625 cpl fixed timing and im not sure if there is cam differences that im not aware of, or if the cam follower bolts differently to the casting (different thickness in the block) that will effect timing the engine...and the nt88 block was a fixed time 300 at one time, it's never been an stc

 

To be honest with you, I know they will bolt up, I am not 100% certain that the coolant passages don't line up, they may just restrict flow too much, I never got to an absolute certainty about what caused the over heating issue (as it does appear they Line up and appear to be the same diameter) so I never was sure what caused the over hearing issue unless the passages just run to the wrong places on the head compared to the block, but it didn't have an overheating issue until I changed the head and I was forced to run it for about a week in a dumptruck at 200ish degrees on the gueage, and after that it caused a cracked liner forcing combustion into cooling system, ive not rebuilt the engine, but there is some speculation between me and my father that it wasn't the cooling at all but rather the non top stop injector didn't set deep enough in the head and caused over fueling (i.e. the injector sleeve isn't machined as deep in the head), I do see a whole lot of signs of over fueling on those 2 cylinders and both were ate up with pin holes after that week, forcing combustion back through the cooling system, but we assume the cooling has something to do with it or it wouldn't have overheated for the first week (there is a small possibility we suppose it was dumping and combusting enough fuel to cause such a problem but it's doubtful, bc while it did smoke it wasn't a whole lot of black smoke like unburnt fuel, appeared more like it needed the overhead ran, which of course we did when we replaced the head)