If this is the same one that popped up here locally on CL a couple of years ago, it's about 30 miles from me in Murfreesboro, TN - if I remember correctly, it's got a casting date of late '69 or '70, legit from what I saw, but a service engine (OTC) if I remember. I still have some additional pics around, be glad to share them if I can locate them. Hefty price tag, to be sure - but way cool.
Regards,
Steve