Nitrous plumbing A1A...??..

If i was in your shoes and was building my first Nitrous system.........well i would have built it just like yours. With all the safety i could put in it.
Then, after all the testing you can do with out pushing the Nitrous threw the eng, i would close the bottle valve, purge the lines........ arm it!!! and go make a hit! If it slows down....all the fuel side is working as intended. Now you know the the worse scenario will be the one you just made......excessive fuel...............and if every thing works right.........a cheese smile on your face.:steering:
I actually gave it a dry test with the carburetors off. On the fuel side I had to test and make sure I was getting the correct fuel pressure when the solenoid was open. So I turned the fuel pump on and turned the arming switch on had my wife push the button inside and watch the gauge well I activated the full throttle switch and watch the fuel. I just stuck a t-shirt down underneath the spray bar to catch the fuel from just going into the engine. I also had to jump the ground off the low pressure switch so I wasn't using the window switch. It activated perfectly. For the nitrous oxide I just disconnected the hoses from the plates and hit the button with the ground grounded and it shot out.. so I feel confident when it's time things will work as I expect them to.
Again I'm not a street racer and the car has way more than enough for driving on the street. This was all something I wanted to do to learn about nitrous. This of course after a couple calls to Mike thermos at nitrous supply.. and if anybody ever has any questions I would call nitrous supply and ask for Mike thermos.. very nice guy and easy to talk to... (Look him up)..
Again the track awaits the nitrous LOL..