Head and block are both cast iron so unlikely to distort... nuts and bolts in an engine that old tend to be rather large and unlikely to round or strip. Oil change takes 5 minutes - 4 minutes of that is waiting for the oil to drain. We've all heard horror stories of stripped bolts and warped heads and so on, but I've never had any trouble working on any of the many 60s/70s cars I've owned - they are rare occurrences.
Head and block are both cast iron so unlikely to distort... nuts and bolts in an engine that old tend to be rather large and unlikely to round or strip. Oil change takes 5 minutes - 4 minutes of that is waiting for the oil to drain. We've all heard horror stories of stripped bolts and warped heads and so on, but I've never had any trouble working on any of the many 60s/70s cars I've owned - they are rare occurrences.