I'm surprised it still has the original style heater hose assembly on it! Trying to remove the hard line at the disconnect probably won't happen, The plastic retainer will break!
If you want to salvage it.....Disconnect it at the heater core & the bracket, Remove it with the intake.
In my opinion, It's a leak waiting to happen & I would eliminate it altogether!
Go ahead & remove it with the intake, Use your "Victor" to heat the boss around the fitting...A brazing tip is usually good enough. Try working the fitting out.
Get a 1/2" NPT to 3/4" Barb/Nipple fitting & a Gates 28481 molded 90° hose. I like to use OE style spring clamps.
You can use a straight hose off the fitting but it puts a lot of stress on the hose right off the fitting. With the 90° hose you tie it back onto the bracket.
The Dorman replacement parts for the original set-up are JUNK!!