I have a 91' gt and am planning to put some twisted wedge heads and a tfs stage 1 cam in it. While i'm at it, would you guys recommend swapping in some new lifters and a new timing chain set? Would the stock ones be worn out to where they should be replaced? My engine has 135,000 miles on it. If so, what lifters and timing chain set would you guys recommend? I don't mind spending the money if it is recommended, but I also wouldn't mind keeping that extra money in my pocket if the stock parts would work perfectly fine. Any input is appreciated.