Iam about to run a stock q-jet on my engine, iam ready to hook everything up to it and i see a hard line coming directly out the back of the carb, i got it from a friend and the line is cut soo i cant tell where it went, can anyone tell me what this line is for.

 

That goes to the power brake booster.

 

I thought thats what it might be but i wasnt too sure about there being a hard line for vacuum, Thanx bro !