I have a 1989 440 convertible, basically the same. Mine had rotted pretty bad. I picket another location with a bit better access and measured the clearance. Bought a small 19 gallon model from Home Depot. Much less expensive way to go.
I just recently had to replace the water heater on my 98 400 EC. To remove the water heater they had to remove the manifold and riser so I decided to relocate the heater, now at least I can service it now
