SS, I have broken in over 80 engines, probably a hundred counting other peoples I've broken in for them and have not messed one up yet. I broke in two Fox Eagle 74's with stock carbs and quiet mufflers then put a Davis Diesel head on one and a Perry regulating pump and Perry pump carb and Mac's tuned quiet pipe on the other. Neither blew up or over heated when changed to the new use. I believe this should end any discussion about my being ignorant.
PS, Thanks Mr. Lynch