I have a 1952 mercury with a newly rebuilt 255 flathead engine. I am wondering if it is necessary to use the break in procudure described in the manual from 1952. I've had other people tell me that since oil is much better now I don't need to be so "strict" in following this break in time. Do I need to be worried about things not getting "set" properly? If I just take it easy on the car for the 1st 1000 miles or so should I be alright. I was also told not to use the overdrive for the first 1000 miles. What should I do?