Vacuum Modulator Line

[redsand]

I have 2 small demon vaccum ports on the passenger side of the carb. Can I use 1 of these to connect to the Vacuum Modulator Line? Will it be enough Vacuum. I tried it and it still seems that the transmission slips when shifting. I only have 1 port on the back of my RPM intake and that is being used for the brake booster. Could I split the intake port 2 ways for both the booster and modulator?

Any help would be greatly appreciated!!

Thanks

[MrQuick]

the modulator requires manifold vacuum. The small port that is on the throttle plate works fine for me.