'79 440 Motorhome short block - Should I buy it?

Well, I bought the motor. It was 200 miles round trip to get it, but think it was worth it. The old guy seemed as honest as they come, and after I bought it and was ready to leave he told me that he spent $3K in this short block. That's seems hard to believe, but it all looks like new. Maybe he meant that he spent $3K on the whole engine...

What is the right compression ratio for a 92 pump gas BB driver? If this is a 8 to 1 motor, and the '67 heads will bring it to about 9 to 1, or slightly less, should I have the heads milled to raise it further? I see a lot of talk of 10 to 1 "pump gas" motors. Is 10 to 1 ideal and would a head mill get me there?

Also, can I be sure there is no problem running my '67 heads on a motorhome motor? I haven't had a chance to study it yet, but I understand that this motorhome block has extra water passages through the deck. I guess that means the motorhome heads have corresponding additional passages for this extra cooling? If this is the case, will running my '67 heads that don't have the extra passages cause any problems like a hotter running engine?

Thanks for your info and advice.

John