66fs is correct. The KISS method works well for mild applications. If your not overly concerned about every last bit of .001 lift but your just looking to do some basic hot rodding, the OE rocker will be fine. Use with mild spring pressures on medium lift cams and all will be good. Im not sure what the OP has in mind for a performance goal in terms of a 1/4 mile time though racing the car may never happen, but a good example of a basic build is when you look at the MP Speed tip section. There cams aren’t a big lifting stick. There cams are low lifting but with a good jump in duration. With a good valve job, the engine performs. Bowl work a plus on some of the tip times is very helpful but not needed if your not bracket racing.