440 Oil Weight

Hello everyone, I have a '70 Dart with a 440 in it that I somewhat recently acquired. I however don't know what weight oil to put in it and am hoping I could get a few good tips with choosing the best weight and brand for my setup. Here's what I know about the 440 in regards to oil questions:
-10.5-1 compression but added 915 heads that brought it up to 11.5-1
-509 cam
-Dual quad high-rise intake with dual 750 Holleys
-7 quart Milodon oil pan