Well, lets play, why won't my engine start,...
It is a 6.1 in a 71 cuda with a Hotwire harness and computer

First let me start with a couple dumb mistakes I made, I hooked the fuel lines up wrong, and ran pressure to the return and now my regulator gauge is acting stupid, did I kill it??

After I switched them it still wouldnt start, but I pulled the line at the engine and it was under a lot of pressure, so at least it got fuel, not sure of the pressure....

I have a cheapo ignition switch hooked up, got it to crank over and pulled a coil, and had good spark...
Could the ignition switch cause the computer to not work?
right now, the computer is just sitting on the floor, should I mount it for grounding?

could the fuel presure not allow it to start, the engine has been sitting since 2007, and only has 2500 miles on it, could the injectors all be clogged?

seems I have fuel and spark???t