I'm restoring my 67 Dodge dart and I'm wondering if I could get some advice on the necessity for cab plating my suspension bolts to be factory correct

 

If it' going to be a points car restoration ? I would use all the correct bolts and fastener's.
But if this is just a run of the mill restoration... I would say just use good hardware... Like Lawson Produces or something along those lines...

https://www.lawsonproducts.com/