3-Point seatbelts into a '64 Dart hardtop?
I installed 3 point seatbelts in my 64 hardtop sedan. I welded the anchor plate to the b-pillar.
I know you have a different kit, but I'll explain my process and you can take what you need from that.
I ground down the paint on the inside of the pillar where I intended to place the anchor, and then clamped it in place. (I had drilled a hole in the b-pillar for the nut on the other side) I welded half of the top, went and welded the passenger side one in the same place, came back and welded the half of the bottom, and repeated on the passenger side. Repeated until I had welded all of it. By going back and forth I was able to prevent building up too much heat and let it dissipate. Just don't try to weld too much all at once, take your time.
I installed 3 point seatbelts in my 64 hardtop sedan. I welded the anchor plate to the b-pillar.
I know you have a different kit, but I'll explain my process and you can take what you need from that.
I ground down the paint on the inside of the pillar where I intended to place the anchor, and then clamped it in place. (I had drilled a hole in the b-pillar for the nut on the other side) I welded half of the top, went and welded the passenger side one in the same place, came back and welded the half of the bottom, and repeated on the passenger side. Repeated until I had welded all of it. By going back and forth I was able to prevent building up too much heat and let it dissipate. Just don't try to weld too much all at once, take your time.