I have a 68 442 I don't have the build sheet nor the number matching motor. Is there another way to find out it is one. By the research I've done, it has all the right equipment to be one. I did found the orginal motor just waiting to hear back. Is there any other tall tail sign to tell beside motor, fender wells, and build sheet.
Thanks

 

W 30 cars are built in Lansing...so it should have an 'M' in the serial number...

 

Well, without the original W-30 engine, the rest of the car is just the same as any other 442. The unique parts will be the red inner fenders (which can be added to any Cutlass) and (if the car is an automatic) an OW TH400 with a matching VIN derivative. Of course, OW tags are also available on Ebay.