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@Scilly.Suffolk
This is my preferred FXD/SS gear calc.
I think you'll find around 80", much to beefy: better suited to the track than the road. Around the 70" mark seems to be most people's preferred road gearing; obviously this depends on terrain, fitness etc.
On a cautionary note, running too big a gear will trash your knees; 40x15 or 52x19 would be where I start.
Running bigger chainrings and sprockets is more mechanically efficient than running the equivalent gear using smaller rings and sprockets, which will also wear more quickly.
Most people who do run both a fixed and freewheel, do seem to have the freewheel a tooth bigger: obviously easier getting up steep hills, whilst allowing you to freewheel down them, rather than pedalling like a nutter.