Oil Ape, you do not need a VB to increase the pressures. I can tell you how to do that. What is needed is what plate you are going to put in and what you are going to use the truck for to see if just a pressure increase on the stock VB is enough. The pressures possible with the stock VB are not enough to hold some plates.
There is no con to increasing the line pressure on a stock VB, pro's are mainly less chance of slippage.
Post or email me if you want more info.