I recently overhauled my 1975 360 engine. I completly went with all new parts including valves and oil pump. I replaced the Intake Manifold with an Edelbrock 390 preformer and installed a edelbrok 1406 electric choke carb. I have about 2000 miles since the overhaul. my problem is the engine uses a quart of oil every tank of gas, (about 250 miles). It has 60 psi oil pressure upon start up, but drops to 25 psi at hiway rpm and down to 10 psi at idle after the engine reaches operating temperature. The engine runs fine (no lifter noise or knocking). It does not smoke. What would you recommend I should do to determine the problem?