I like the 73-74 units but after buying the reservoir and the bracket, the cost would be more than I am willing to pay. Plus the overflow nipple on my current radiator exits out on the passenger side of the radiator. Thanks for the picture.

I am now leaning towards the Dorman 603-121 "pressurized" unit. I should be able to mount it to the front of the radiator support beside where my current overflow hose is routed. This would keep it out of the way and I would not have to remove my existing windshield washer reservoir.

Would I need a specific radiator cap with this pressurized tank or can I keep my existing radiator cap that was used with the overflow hose (stock 16lb unit)?