Well this is my first post on here and so that means I must be the new owner of a 67 dart! So lets revell in todays event, shall we?
I picked up the car today and started on my way home with my mother following me. The whole ride was horrible due to the fact that I thought a connecting rod had let loose(the guy I bought it off of told me he thought a rod was knocking so i got a huge discount), the whole dam car was shaking.
So about halfway home the most incredible thing happened... the right-front passenger wheel made the notion to loose all its lugnuts and haulass past the car into a ditch and i was forced to slam on the brakes and skid into some driveway!
I was laughing my man-titties off after i realized what happened and my mom was about as pale as flour when she pulled up next to me.
I was amazed that none of the studs were broke (Ive always been told those shaft mount nuts is junk)
Well anyway I tore all the drum brake stuff off and popped the wheel back on so we could get it onto the tow truck and now it sits in my garage waiting to be fixed.
*NOTE* I know that driving a motor with a serious problem like that is pretty dumb, but i got another motor lined up anyway and i think im to young to worry AND i know i shouldn't laugh when my newly bought car just lost a wheel doing 40 down the road.
Sorry for the long read but i had to tell somebody...

So i ask can i just purchase wheels with a conical seat and matching lugnuts and bolt them to the hubs on thier so I never have to worry about this again? Or is a conical seat wheel change mean new hubs/spindle/etc.?

Well, one problem will quickly raise it's ugly head. 63-72 Darts, and some 4-doors made after 1972 have a 4" lug bolt circle, so very few wheel will actually fit. Problem #2 is you did not mention which wheel fell off, one side is left hand thread on early Mopars. Please give us more info, and we will be glad to help you out. BTW, I have been beating the crap out of early Darts for 30 years now, and can probably get you going quickly, as well as many others on this here board.

He did mention that "the right-front passenger tire" fell off, so concerning the one that fell off, the left hand threads aren't an issue. However, if he replaces all the wheels with the conical style holes, then he has two options: he can either get left-hand threaded nuts for the left side of the car, or he can replace all the studs on the left side with right hand threaded studs (an option I've used myself). As far as finding wheels with the right bolt pattern - good luck.

Keep the lug nuts tight and the wheels won't fall off. No need for any special style of wheel.