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Car in question is a 68 B-Body, no power brakes.
Rob you don't happen to have a pic of how it looks running to the manifold do you? I know it's already been stated where it's located, just wanted to see the stock location and the correct nipple since currently my intake is an aftermarket Edelbrock RPM for smallblock.



as said the pic above is a 70 so it's different at the firewall .

not sure but there may be a nipple that has just the small tube ? otherwise it would be the 3/8 nipple , capped , with one small tube coming off it .