I will do the proper searches, but until then, if anyone has immediate info: block: ECK 6015 B heads: ECZ-C
Cool! I had the same heads on my 292. The '57-'59 heads had bigger valves, but those C heads are fine on a mostly-stock street motor. I had those heads on my pickup, and with an Edelbrock 4bbl, it was a lot of fun. I miss that motor.