I'm running a freshly rebuilt Gen1 350 sbc that has about 1200 miles since rebuilt and want to replace the oil but not sure what to use. It was bored .030 over, flat top pistons, mild Comp cam, Edelbrock intake with AVS-2 650 carb, headers, etc. Fairly mild motor, probable makes makes 280-300 hp. I'm in mild northern CA climate. Motor runs 185-205 temps and is not driven daily, maybe couple of short drives per month to car events or Sunday drives. Any recommendations for oil grade/weight?