To me, it sounds like several things are going on here. First of all a lot of high performance stuff was done on the top end. That was all bolted on to a really tired bottom end. That really is the wrong way to go.
The fuel pump probably should have been replaced with at least a top quality unit if not higher performance to keep up with the fuel demands of all of the performance parts. If you are having issues with it, it might be due to ignition retard because of burning the oil. Oil in the combustion chamber lowers octane, I would hope you are running high octane fuel with all of that cam and a tune.
As for oil, you may want to try a thicker oil to deal with the engine wear and see if that helps you. I think the problem is that not everything was done the way it should and these are the final results. Also you will most likely need to change your oil more often than you would on a stock engine because of the modifications.
The fuel pump probably should have been replaced with at least a top quality unit if not higher performance to keep up with the fuel demands of all of the performance parts. If you are having issues with it, it might be due to ignition retard because of burning the oil. Oil in the combustion chamber lowers octane, I would hope you are running high octane fuel with all of that cam and a tune.
As for oil, you may want to try a thicker oil to deal with the engine wear and see if that helps you. I think the problem is that not everything was done the way it should and these are the final results. Also you will most likely need to change your oil more often than you would on a stock engine because of the modifications.