Look at it from a logical perspective:
1) engine was running but had a tap
2) head swapped & new timing kit
3) now engine doesn't start after repair
4) disable cps & engine runs but runs like crap
5) connect cps and engine dies
Trouble is related to the work performed. It can be as simple as a pinched wire or as bad as the cam is out of time. If the cam is out it should show up as low compression on that cylinder bank. (Hope it isn't this)
When he changed the timing chains did he lock the cams in place? Once the chains were on, did he rotate the engine at least 4 revolutions to check for interference?
Where did you source the replacement head?
Also, sometimes we reply quickly other times it may take a day or two - it depends if we are busting knuckles on projects.