I am confused about the square tooth vs. round tooth thing. I just picked up an 88 TBI roller cam for my 85 Turbo Daytona. My daytona looks to have a square tooth pattern on the cam. The 88 cam appears to have the same square tooth design. I thought that I would see a problem with this mod. Is it only newer than 88 cars that have the round tooth design? Also, If both are square tooth, do I still need to adjust the timing 4 degrees to get rid of the 4 degree retarded situation? Thanks for your help!