If you've been running on that 7/8ths chain for very long I would just have a new one ready, they stretch in that whp range. Depending on how much you use it and how much weight you dropped, it may need changed yearly.
At this rate he could put a fresh chain in it monthly....every time its burned up...
1999 GTP Coupe ------ Comp Cam 76-802-9, 2.7" pulley, S2IC, N*, FWI, SD Headers, DHP Tune, Built trans (single 3.29s, 300m), Magnaflow Catback, 60#injectors, E85, MT ET Street DR's, Fbody brakes, PRJ pump/rails. 302whp/328ft-lbs.......12.41@110mph