I does have a dual snorkel air cleaner. And good chance it does have the HP manifolds. Not saying that is a guarantee of a HP stamped motor. But those items certainly raise the chances.
The single exhaust extension out the back could be a killer on the HP motor deal. Should have duals I believe. But could have been replaced in 40+ years.
Doesn't seem like a car to bother being shipped from California to Indiana. Sure it does seem like a great optioned Polara 500...but it's still a 69 Polara. I guess the seller would be/is really really really be into 69 Dodge Polara/Monaco's. Eclectic tastes for sure.