I measured the track of my RV-8 project, which is on the gear but without engine, wings, or tail surfaces attached - so the legs are not splayed out to the ready-to-fly position. From the outboard most position of each main gear tire, the track is 78 inches. Would be a few inches more with the engine installed.
RV-8 Fuselage Slow-Build In-work; on gear
Tail Kit complete