Csaba Csere had a column on the "cylinder count" game way back when...he came up with something like 80ish for himself. Unfortunately, he was playing against Jack Roush, who almost topped Csaba out with just his AIRCRAFT, let alone cars..."It really helps your total when you own multiple P-51s." And then John Travolta got in it, nearly topping Roush out with just ONE of his planes....(Travolta owns a Lockheed Constellation, with 4 Wright R-3350s with 18 cylinders each.)
No idea who has the most...Leno has several hundred, maybe over a thousand. Locally, Len Immke, Dave Gill, and Dave Thomas had extensive car collections.
But I'll take odds on the Sultan of Brunei....the collection reportedly runs to "several THOUSAND" cars.