sbc performer plus cams

i just bought an edelbrock performer plus cam for my 350 motor and have a question i hope someone can answer.it had a warning in the box saying i had to buy a edelbrock timing gear set becouse stock sbc timing chain gears are not marked true but machined in a retarded position.i dont want to have to degree the cam and hope that stock timing gear marks will time at true 0 with this cam.has anyone else heard this about small blocks or do you think edelbrock is just trying to scare people that know very little about cams into buying there timing set?.someone with performer plus cam experince please help.