I built my system like you and your son.I am only trying to share this advice to help.
If your struggling with how to change the fuel mapping or the timing mapping you will need help from someone who tunes injection or someone who will answer your questions.I tried FAST technical support when I got my car running and went through the exact frustration your going through now.If you know someone who tunes that would be your best bet.If not you could call rich at fastman EFI. For 250 dollars he will answer all your questions and work with you on a tune by sending data logs through email.John you and your son will enjoy the injection.I do understand what your going through I thought I would be able to tune mine and unfortunately my system with the blow through was just to complicated for me.I would sink the timing on the distributor to the computer that will help it start and run.I had the same problem and that was the first thing we did during the the first dyno session.
The fact that you and your son are doing this together even if its not going the way you thought
is AWESOME!!Stay strong you'll get it going.
I thought I would never get my car running right either but I drove it last night and it runs great.
Thanks,Joe