Save your money on the oil pump stuff. Unless your front cover, pump cover, or gears are really chewed up, just go with the stock stuff. Except for the dry sump system I'll be going with, I've got over 10 year of racing with the stock stuff and no problems. (I might consider the Reese pump if I wasn't going to the dry sump but for ITB you can't do that. The steel cover also looks like may be a good idea, but I'm not sure it would be legal for ITB... then again I would have to go back and re-read the rules looking for a specific clause or loophole that might allow it.)
If you have one of the timing case covers with the pressure relief in it, then completely block it off.. JB weld or spacers (washers) to compress the spring. Then, in the pump cover... the kind with the relief valve in it... use spacers (washers) under the spring to bring the oil pressure up to 60 PSI. If you need a new pump cover you can get it from the OGTS.
You might also consider a pump cover modified with a bolt adjuster to modify the spring tension if you think this might be legal. However, be careful as a long bolt sticking out is vulnerable to damage. If the bolt got hit you might develop a leak and drain the oil from your engine. (If you've read my 2003 wrap-up then you know this kind of problem is now near and dear to my heart.)