Help with 68 396/375 AUTO

[Michael4yah]

A few years ago I bought a 68 SSRS w/o engine, trans, driveshaft, or trans mount. It did have 396 markings, 6K redline tic toc tach that appears original, Big block motor mounts and 12 bolt rear end. The build sheet is gone along with everything in the engine compartment except the steering box and motor mounts. It has front disc brakes and a floor mounted shifter w/ console and guages. The floors look unmolested and so does the dash. I want to restore the car but dont know what engine to use. Some of the books say that 396/375s did not come with turbo 400's. Some leave that out stopping short of not saying they never existed. Is there anyone out there that can give me some advice on what else to look for. For instance is there a tale tell sign somewhere on the tic toc tach that would tell me its a reproduction and not original equiptment? Any advice would be greatly appreciated. Michael SoCal