TH350-C tcc question?

[chevyjr73]

whats up? i have a 1986 chevrolet c-10 1/2 ton truck and have a question regarding the vacuum source for the th350-c tcc vacuum switch by the brake booster. does the vacuum supposed to be manifold or ported and also its going through a thermal vacuum switch, should this only open when the temp is warm? right now it lets vacuum through when cold and shuts it off when hot. i have disconnected my egr bleed solenoid so i dont know if this is affecting it any. i have replaced the esc distributor with a old style vaccum advance and installed a edelbrock performer 600 carburetor.