741, cone sure sure grip, 3.23, 1970. What is it worth?

I had one like this 5-6 years ago. Took it to a guy who rebuilds them and asked his opinion about it.
He told me to run it, change the oil after 100-200 miles, then add fresh oil and additive.
When I pulled it for the oil change it looked a lot better. I’ve had it in and out a few times to try other ratios but always go back to the 3:23 and it looks really good.
I’ve been running it ever since. No issues.
If you have the time, I suggest running it and do the same advice as I was given.
If you still want to sell it, it will be easier in my opinion.
I wish you the best.