1993 lx anti freeze leak

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I just recently bought a 1993 mustang.
The previous owner put in a cobra upper and lower intake manifold which eliminates the EGR plate. They caped off the coolant line with a rubber plug which use to go to the egr plate. The plug dried up and anti-freeze spayed every were.
Is there any other way of plugging it up because It going
to happen again due to pressure and heat. I know I can also weld it shut. Someone told me instaead off plugging it up,I can run the coolant line to the lower intake. Does anyone have any Ideas? I'm a rooky and would appreciate any feed back.
Thanks

I appreciate your help, But Im slight confused. You stated to attach a piece of copper tubing to both ends of the rubber hose. I know were one end of the hose is which is where it’s leaking from. Where is the other end located? Thanks again

Thanks, thats exactly what I did.