As per Crower:

"Level 4 camshafts are designed for heavily modified engines. These camshaft have a definite lope at idle and are best suited for dual purpose hot street/drag strip, hot marine or oval track applications. These grinds exhibit strong mid-range to top end torque and horsepower. Headers, dual exhaust, large cfm carburetor, performance ignition and increased compression of 10.25:1 and above are required. Cylinder head modifications would be beneficial. Use with standard manual transmission or automatic with high stall torque converter. Again, close attention to proper ring and pinion and tire diameter selection is imperative."

Installation manual is at:

http://www.crower.com/media/pdf/cam_book.pdf

They reference a degreeing kit, part number 81706 that looks to be available only from Crower:

Degreeing Kit

Good luck!
Glenn