I say light it off after priming carb let it run at 2200RPM for at least 20 minutes then go drive it after cool down to cold and oil check drive it 25 miles vary the speed. If the cam is going to wipe it will weather you prime it or not, I never see how all the drama of a engine startup makes any difference in the results. I coat my cam with wheel bearing grease tappets with atf and 30 weight oil mixed 50-50 I feel it will blow or go. Do you really think the assembly line guy baby the engines just built? I have been to the plants and those guys are hard on cars / trucks just built. Just change the oil after a 100 miles or so use it in your mower if you don't see metal and if you do guess what your **** By the way I have done this a pile of times and never had a real problem period