(Dec 2007)
The white one shipped to Moline, R5642 and sold at auction by Dick Marty has a short enough history that it should still have the original engine. 

R5642 was originally shipped to Moline IL.

(dec 2007)
R5394 Akron Ohio
R5546 Doraville Ga
R5625 Wixom Mi
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R5642 Toronto but rumored sold / 5642 Was sold by Dick Marty in Canada at a RM auction about 2004
Feb 2008
	A few years ago, I replaced a rear axle bearing on a factory R3 Avanti (R5642). The axle appeared to be a Ford 1/2 ton model 44 axle, narrowed to suit the Avanti. The bearing kit was accessed from a local parts store as part no. CR88128-R for an early 60's to late 70's Ford pickup and came complete with the wedding band. The axle shaft had 2 welds, one on the outer flange and one at the inner hub extreme, both being peripheral welds. The machine shop that pressed the bearing off and on stated that the welding was typical of that performed on narrowing axles for drag racers. As pointed out, the axle tubes were larger in diameter and the shafts were quite stout compared to the Stude axle. Unfortunately, I didn't take any measurements.
Bill Patterson
Location:  	Glenburnie, Ontario
Canada

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R5532 Unknown whereabouts but the body may be in LA with the wrong motor and the motor may be in a 1964 convertible.