Im having oil pressure fluctuations on my 57 chevy 235 with hydramatic transmission. When its in idle the oil pressure is close to 30psi when i put it in gear(I-4) it drops close to 0 and a clicking noise starts to appear. Engine level is good with clean oil. Im also having oil leaks that are coming from the transmission. Any body know where i can get new gaskets to reseal the transmission? Thanks for the help.