I would bet from the exhaust manifolds that's a 360.... 318 manifolds weren't that beefy... Unless they put different ones on truck motors...
Plus the kick down linkage is not from 1970, it looks like from mid 70's like 74 give or take...
I also think they got the valve covers on backwards, usually the pcv is on the passenger side... :BangHead:
Either way, it's a good score... Way to go Keith... :thumbsup: