Well a head let go on my 89 mustang gt and i have the money to order heads for it and i need to order tonight so i can do the swap as is this my daily driver/weekend warrior. I wanted to go with the WP windsor Jrs with the 58cc combustion chambers, the will work with stock pistons and cam and it will also RAISE compression. But the windsor sr. have 64cc chambers (basically stock size) but flow a little better. So here is the deal: higher compression, but still running on 93 octane or better flow? Also i don't want to spend alot of money on rocker arms but these heads are stud mount rocker arms so stock one's will not work, so which one's do i buy, someone told me roller rockers won't last long only about 10,000 miles but i have no idea about rocker arms. Any info/suggestions Thanks alot!!!!!!!!!