Hello everybody! I want to replace the old heater hoses on my 1972 stock 350. The old hoses are 3/4 inch that run into and out of the expansion tank. I have a small leak at the hose connection at the bottom of the tank on the hose that runs into the water pump. Question: Is 3/4 inch the correct size or would 5/8 inch be better?? Also any pointers or problems to watch out for when replacing these hoses? Thanks.