When to freshen engine

Thanks for all the replies! The po was a serious racer and worked part time at a machine shop that did a lot of race engines. He used the BME rods because they are rated for 2,000 hp and 8,000 rpm. I called BME and they told me that they will be the last set of rods I ever need at my hp and rpm level. I do plan on sending them back to be gone over when I pull it a part. Cheap insurance @ $25 a rod plus shipping.
I'll leak it down at the end of the season and have the oil analyzed.
How many runs on average do you all get out of a engine before you reach that 10% leakage? Does anyone use oil pressure as a indicator?
Thanks again!