Valves look good. Two years ago I sold a 75' 360 with 53,000 miles on it that came out of my friend's camper in Florida. So, I say it is possible. I'm still waiting for the balance, $100.00.
I’m still debating on just running the other cracked head and porting it. Lol I have cracked mag heads on my other engine, and it runs a 8.6 at 80 mph in the 1/8 lol , if the engine does have 50k I bought the cracks are too bad lol