Water through Intake Manifolds

YR,
If there is a way to get even heating across the I.M., I'd like to do that. I don't want to block off the existing water passages into the I.M..

I'm not sure what you mean by staggered jetting; I have a 1403 Edelbrock, 500 cfm, 4 barrel carb. Since the I.M. inner passages (3,4,5,& 6) are colder, I can understand that those cylinders will need a different fuel mixture than the outer (1,2,7 & 8) ones, heated by water passages, but I don't see how to do that with my carb..

Should hotter plugs be used in 3,4,5 & 6?
Should I go by plug readings?


Yes, go by plug reading.

You may need a different main jet on the right front than you do on the left front. Or a slightly different metering Rod to either lean out or richen up some cylinders.

It's not as uncommon as you may think.