Hi GMCDAC . . .

Sometimes I get single minded - I was only looking at passenger car application codes:
YearOne


Looks like you have a block that was originally in a truck:
67-72ChevyTrucks.com

So the engine came out of Flint 'F' in November '11' on the tenth day '10' with an application code of SKT. The circa '75 manual pages posted on the Chevy Truck site indicate a '66 G10 with a 230 and manual transmission.

Note sure what the additional T designates. Could be some kind of 'fleet' build. Some car codes use T to designate a Taxi.

regards,
stock49