Not sure how much further i would push it passed 650whp. Torque has got to be getting up there, Puts so much stress on those tooth pick rods. Ya they might not break but it sure fatigues them over time.
When my 350 was at 650whp i could hook second on concrete and thats about it. I like the Nitto NT05R's, and the ET street 2's. They only last about 3k miles but they will hook in second almost every time. I have the Toyo Tq's on my car now. They were ok in the beginning but fade off towards the end. I did manage to get 10K miles out of them. There slightly better then the R888 but not as good as the Nt05 or ETs2.
Good luck on the tuning!
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