Did you click on the link I posted for the decode? A Targetmaster engine was the early crate engine supplied by Chevrolet. They were made in the USA as well as Mexico. The back of the Mexican blocks have Hencho in Mexico , while the USA blocks usually had the engine designation, such as 350, in your case, on the back of the block where the transmission or bellhousing bolts on. They were budget engines, with 882 or 993 smog heads. I had a friend who always bought them up, added a L-79 cam, some 492 OTC heads, an aluminum intake and headers. They really woke up the engine.