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

Thanks guys! I'm going tonight to buy it. He gave me a casting number of 4006630-440-7 with a date of 4-14-78.

I have a set of '67 closed chamber heads. If this motor is a 8 to 1 compression (or less) motor, does anyone know what the ballpark ratio will be with the '67 heads?

Thanks,
John