You will be revving the 52 engine higher than necessary with a 12 x 4 prop. The 12.25 x 13.75 is great for 46 engines, but rather a light load for a 52..

Use a 13 x 4 or even 13 x 4 wideblade. This engine works well with those props. I know, I have a 52 and a 46.