So I'm putting together a GT40P top end, ported, F303 cam, upgraded valve springs. With that cam it should make peak power at about 6k, so I plan to have it able to rev out a bit higher then that to maybe 6500. Would it be worth the money to go with better lifters, or would OEM ones be fine? I havn't been able to find the difference on the Ford Racing high performance ones or anything, so I'm just curious if it'd even be worth it. A couple other forums say the OEM ones are fine up to about 7k anyways, anyone have input?