72 sbc newly rebuilt trying to find pushrod length with vortec heads. If I set the rockers to 90 degrees at half lift I have a contact patch that is way too far outboard on the valve stem. To get a good contact point i have to almost bottom out the rocker and the 90 degree aspect is shot. Nowhere near. That is with the guide plates off! Even worse with the guide plates. This is checking with aluminum roller rocker and with Comp steel roller rockers. I can do one or the other but can't get both even close. Using checker springs to see what's going on without having to turn the motor. Lee.