While the 58-62 blocks were sidemounters, the mount is not in the same position as on the 52-54. Get out your tapemeasure and see. The 55-62 motors can still be used in 49-54 cars, but you will need to change your front mount, and the water pump will need to be shortened. I would try mounting it like a 49-51 (under the timing cover) or getting a pair of those "biscuit" type mounts like you see in streetrod catalogs (for V8's) and use those.
