I bought an old sonic 30 with modified 454's with crossovers instead of circulating pumps. Even at an idle, I noticed periodic low water pressure on first one and then the other motor. I found that both mercruiser raw water pumps were leaking through the weep holes. I had new seal kits installed in the pump heads, And I have new impellers for them when I reinstall. Do you think I've solved the problem? The boat has low water pickups on either side of the keel, and after market thermo housings, with 150 thermos installed. Any advice will be greatly appreciated.