I recently bought a 68 convertible. This is my first Corvette. I don't know much about them. I understand that there were several different engines available for that car. How do I determine which engine is in it? Thanks for the help.

First, congratulations on a wise choice of Corvettes. I love C-3s and particularly the chrome bumpered ones.
Go to these two sites. The first will help you identify the engine in your Corvette as well as help you with production numbers.
The second site, MorTec, will help you with casting numbers of blocks, heads, etc. whether the engine is or is not correct to the car.

http://www.idavette.net/facts.htm

http://www.vehicleidentificationnumber.com/chevrolet_engine_numbers.html

Enjoy,
Scott S.
1970 LS-5 convertible

Ditto on the choice of a Vette...!!!

Here's clickable versions of the above sites:

http://www.idavette.net/facts.htm

http://www.vehicleidentificationnumber.com/chevrolet_engine_numbers.html

Thanks, Norsky. You've got a beautiful Corvette. I haven't figured out to this day how to get pictures posted. Doesn't matter yet. Mine is still at my mechanic's. He's keeping it until my house gets rebuilt and habitable.

Scott