I have a Snowbee 1D "head" if interested. I cut the running-line out of a 7/8 full-floater resulting in a head of 50 feet with 7 foot back-taper at ~ 550 grains. Works well for a 6/8 Highlander C. It is short by what you are looking for, but yours to splice a PVC running line and go for it if you want it.
I have a Rio Accelerator 7/8 70' Full-intermediate. Intact with hinge. Bit of a museum-piece: I doubt you will find one of these anymore.
or a Delta Long 7/8 ~ 550 grain at 50 feet (cut and looped at 15 feet for tips.)
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