We did not see a pan rail number. But feeling up the front it may have the drilled bosses for a M-code car. Would the OTC block have these mount holes?
I was wondering about the double lines on the heads?
It is definitely a built motor all the bolts head and flex plate are ARP. it looks like they bought a long block and added an intake and manifolds to install it in a street car. From what we could see it looks like it came out of a race car.