You will need a minimum of a 150 gph pump with less than 7 lbs of pressure.
I'd start with a 10w30 and look at your oil pressure, hot at idle. If it's below 15-20, bump it up to a 10w40 or 15w50. Us a detergent oil as mentioned.
Redline is likely around 6200 with a hydraulic cam, 6500 with a mechanical.
Unless things have changed, Edelbrock's biggest carb is 750 cfm. That's to small for a 540. I agree that people think they look cool but you will need to go to a holley if you want to swap to one carb. I'd take a good look at the plugs if you think it's not running correctly.
Call the car what you want.
