Technical 1951 powerglide trans lines

I have a 1951 chevy styleline with a powerglide trans that I'm putting back together, (engine and trans were removed by previous owner) I have 3 lines coming from the trans, I know two of them are for the trans cooler but I have a 3rd line that I have no idea about, it's coming out of the side cover on the passenger side of trans and runs all the way to the front near the radiator area but there is nothing there for it to hook up to,

if anyone knows what this might be for I'd be grateful, I'm pretty sure I can just remove this line and plug it but I want to be sure before I fire this thing up

 

I think one is the Vacuum line

 

Sorry, trying to get picture to upload

 

Modulator - goes to the tee on the intake.

 

^^^x2

 

for Vacuum.

 

You wouldn't happen to have a picture of the tee at the intake would you.? I bought this car already taken apart, so I'm learning all this old stuff while I put it back together