I would run what you have for now. You might even run as fast shifting at 5500 rpm? The main thing with the oiling system you have is do not run real loose bearing clearances and heavy oil. You can easily pump the pan dry with only six quarts of oil to work with. It might be a good idea to run a 30 psi oil sending switch and add a warning light. Screws into the back top of the block oil passage. That way you will have a warning if pressure gets low.