I am restoring a 50 f-1. I bought a running flatty. It is suppose to be a 49 but I noticed it just had a piece of flat iron bolted to water pumps as a motor mounts. I noticed on most all other engines that the mounts are part of the water pump. I looked in a manual and it says there are early and later "R" series flatties. I wonder if it is really a 49. Why did Ford make this change?