I don't know what "DEF" means. It should be "DEH" which is the Comp dual energy hydraulic. Looks like someone thought it was an F and inscribed it wrong. I agree with PHR's assessment. That's a good grind, too.
Thoughts on on how much power a combination could make with that cam, comp roller tip rockers, rpm intake, headers, KB 237 Pistons flat decked, looks like ports were opened up and a compression ratio around 9.6-10.0