The boat is a 21' regal, it had a 4.3lx mercruiser and Im putting is a 1996 suburban vortec 350. It has a alpha 1 drive and the gear ratio of the 4.3 is different than the 350. Im going to reprop instead of regear. Ive heard another guy that did the same swap and ran a 4 blade bravo 1 14 3/4" x 25". Know next to nothing about props so looking for some recommendations. Thanks.