...last used by P&W for generating wind gusts for turbine engine testing where I work.
I visited P&W on the occasion of their 50th anniversary open house (10/76) and saw that rig; The 4360 was mounted on a flatbed trailer, had a cut-down HS prop, and an exhaust stack that looked like a half-dozen oil drums welded end-to-end to divert the exhaust away from the inlet of the engine being tested. (I believe the test engine was the JT10D, sort of a predecessor of the V2500)
Just for a kick, you might check around on Ebay for tooling and test hardware - maybe even a prop.
If New England Air Museum (formerly Bradley Air Museum) is still around, they might have a lead on a prop.