The remains of what looked like a car were nearby.  I don't know if there are any pictures of it though.

Actually, now that I think of it... its probably older than that because I don't see provisions for an EGR valve on the intake.

My guess is an early 80's 302 out of a truck. Its not a 351 windsor because they have a different firing order than whats on the intake. The transmission is a C6 with the tailshaft housing removed.