Nitrous plumbing A1A...??..

The solenoid may be rated@250 because they have the .110 orifice, larger than the old cheater noid, but your splitting the jets which we've discussed before, we know that a 33n jet in each plate = 100 shot if I remember correct, if you wanna go bigger you can and thats where the retard boxes come into play more so if your going to run it with a 5>6+ smaller F jet for more power, then more retard is more important.
I'll have to order the kits and see the exact size of the Jets if they're listed when I get them. It just says 50, 75 and 100 for each one. I'm not sure what the actual jet sizes but Edelbrock Generally when I looked up there specs are Square..