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I am going to install a stock c4 and have a question about connecting the vacuum modulator to the port on the back of my carb. I am running 15psi of boost and am not sure what that will do to the modulator? May be a stupid question but I am new to auto's. Anyone will any info would be great.
Thanks.
 

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I think you should connect to the intake , under the blower theninstall a check valve in the mod line that allows vacuum to pull and stop pressure back to the mod. Between the check valve and the mod valve in the same line , install and adjustable air bleed valve. Take it for a drive and adjust the bleed valve (normal non boosted driving) to make part throttle shifts nice but is still bleeding off a little vacuum and you should be as good as you will get. Now when you go to boost , the check valve checks and the bleed valve bleeds off the remaining vacuum in the line and the trans thinks your at WOT. May be a little tricky to get used to but you'll get the hang of it.
The other alternative is a manual valve body in the trans.

Hutch
 
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