OK 440 rebuilt a few years ago just installed, motor wont start I went threw everything! Hours have been spent on this and I found one thing that dosn't seem correct? I noticed two of the four cylinders on each side of the motor dont have the correct sequence for the opening of the intake and exhaust valves? Almost as if the incorrect cam is installed? As you know the valves quickly open Exhaust then intake then you have your pause and then again a quik bump of the exhaust then intake. Well on cylinder 1 and 3 (and the passenger side I cant remember what two cylinders)its in the order of intake then exhaust.
If your confused ask me some question and I will try to answer.

Thanks!