I did a bit more research and found I was wrong, it is not a 230, it's actually a 250. I have found that the combination of Engine casting number 3921968, and Stamping F0807CQ (near the distributor) comes back as the following:

Year Model Engine Horsepower Code
1967 Chevelle 250cid, Powerglide. CQ
1968 Camaro 250cid, Powerglide. CQ
1968 Chevelle 250cid, Powerglide. CQ
1968 Chevrolet 250cid, Powerglide. CQ
1968 Nova 250cid, Powerglide. CQ

http://www.thecamaro.com/Decoding/Chevy-Engine-Code-Decoding/enginedecoder.php

Either way, the old I6 motors are good, strong runners. Keep what you've got, just rebuild it.

Dave

1963 C10 Longbed Fleetside (1977-1987)
1962 C10 Shortbed Stepside (2003 - present)
2006 2500 Dodge Quadcab 4x4 (2007 - present)