Doug's headers not fitting - frustration

Uncle Bob said
I am counting it as a lesson learned even though I hope I never have to use it again. Before lifting the k-frame to the frame rail, bolt the transmission to the cross member to the body and move it all as far to the rear as the transmission will allow. Then square up the K-frame to the frame rails at the front, and send those big bolts home.
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My K Frame to Frame Rail bolts have a big taper which locates the K Frame with zero tolerance. So it always sits in one location no way for it to be off. All I have to do is get bolts started in frame rails and once they run up the taper by bolt head precisely locates K Frame on Frame Rails. Your bolts don't have the taper?