Hit the Chevy site and the OZ cars have the R 7 digit engine numbers. This is probably after 1924 The R1559067 and casting 344824 fit the listing below

http://home.earthlink.net/~scrippsbooth/chev490cast.html

ENGINE SERIAL & CASTING NO. FOR 1916-24 490/SUPERIOR MODELS -

R1220135 J-11-23 ? RHD, AUST, flywheel only
R1246717 327773 J-23-3 Ferro3 RHD, AUST
R1288589 335291 L-17-3 ? RHD, AUST, flywheel only
R1353336 327772 L-13-23 GWC 5 RHD, AUST, head only # stamped
R1353347 327772 A-15-24 GWC 5 RHD, AU, head only #1035
R1420256 377773 C-25-4 Ferro4 C-12-4 ? RHD, AUST
R1528991 327773 L-17-3 SPC 5 327772 B-29-4 H 5 P1 RHD, AUST, #1528991 exh port
R1537322 335291 J-9-4 GL 6 RHD, AUST, flywheel only

So you have a Rugby Superior ha ha. Not the first time our cars are mishmash of other vehicles. There was one earlier this year with a 1948 engine in it (Kaiser engine ??) Few years back a lad was trying to identify his Star with the F rad shell and crest. Only thing Durant on the car was the shell / crest. Body off a brass era car, brass lights 1900's, Ford T steering column / front wheels / cut front axe, engine from some German farm machine of the teens. We never did determine what the rear wheels and odd hub caps were from.

Where Are You From? Ottawa Ont

Do You own a car built by Durant? 1932 Dominion built 614 Sedan

Definitely a '25 Chevy! Now let's see what the rest of the car looks like!

Where Are You From? Texarkana, TX

Do You own a car built by Durant? Several plus 1