Rotella diesel oil in a 440 ???

Hey Guys,
I was told buy the guy who sold me my car (72 Duster 440) that I should run Rotella oil in it because it has the right stuff for cam bearings....this was told to him by Crane Cams.
The cam makes a groweling sound that I have not herd for any engine before.

Here is the low down on the engine...form the builder...Please let me know what you think...I'm not a gear head and don't know this stuff...BUT I want to learn.
The 440 engine is dated 1-5-71. I had a set of 452 heads modified by a local Mopar racer; they were milled .010, had 2.14x1.81 valves installed with dual springs with dampers, and bowl ported. The block was bored .030, and the crank was cut .010/.010. Rods are 535 units, pistons are Keith Black 236 units with Speed Pro rings. All gaskets were Fel-Pro. Cam is a Crane unit with .467/.494 lift and the lifters are crane anti-pump ups. Pushrods are Crane 3/8" with Crane adjustable ductile iron rockers. The intake is a Weiand dual plane unit and the carb was a new in the box 1982 unit 3310 Holley, so it is all metal, no plastic parts. Exhaust is factory HP manifolds with 2.5" pipe all new from the manifolds to the tailpipes and Flowmaster mufflers. Ignition is factory electronic stuff, all remanufactured or replaced. ARP rod bolts were used. High Volume oil pump was used and the oil pump shaft bushing was replaced.

Well what do I need to know, change, fix or replace?
Anyone know what I should time it at. I retarded it a bit because my new 800 cca battery did not like starting it after it warmed up.

Thanks for you kind help guys ! Bud :salute: