You have the cam in at a 106 ICL if I read everything correctly. Installing back to 2* or even 4* more advanced from the 2* advanced now will help build cylinder pressure.

I dont know much about the 440-25 intake but I figure its plenum area and ports are bigger then the stock intake you were running. I see you stated you took steps to reduce some of that area, as I read it.

Between the extra area of that intake and the combined lower Quality,and Slower speed of the intake charge with the extra overlap, that would make it harder to fire. You may have other issues going on as well, maybe a vac leak as well.

Id go at least back to a 104 ICL maybe even a 102, but dont expect it to help to much. You may see a increase in cranking PSI around 10' per each 2* advance. Definately more then you have right now, whatever that is.