I have an 89 GT with 125k miles well taken care of and doesnt smoke. It uses oil a little but I think is because I need valve cover gaskets oil wetness can be seen near the rear of the valve covers and along the cyclinder heads. I did a compression check on all cylinders and it reads 165lbs - 175lbs on average. My plan is to install AFR 165 Heads, 1.6 rockers, TFS stage 1 or Anderson N-41 cam, GT-40 U/L intake and 70mm TB. Do I really need to rebuild the bottom end on this engine before I commit to these bolt-ons. Help.