HELP 1975 Dart Swinger ISO parts

Hello everyone I am new to the Mopar scene. I have always wanted to build a Mopar but with me having never done it before comes a lot of new challenges I have never faced while building cheverolets and fords. PART AVAILABILITY and what years interchange. So me and my Brother have always loved the Dart Swinger and with my Brother passing away unexpectedly I thought what better way to honor him than to build the car we always talked about. So with that being said I purchased a 1975 Dart Swinger. Here is where I need some help. I'm Am building this car on and am in need of certain parts and I have been told that some parts off of some of the earlier cars will fit but not all. Below is some parts I need and I'm sure more to come. Any help comments or links for these part is appreciated.

1. Trim for the vynil top (what years and models will work)
2. driver fender
3. Grille (wanting to put the 73-74 grille in so need the header panel for a 73-74 as well)
4. Factory rally wheels
5. Bumpers front and rear.
6. Dash pad
7. Will the slant 6 tranny crossmember work on the 360/727 combo?
8. Accessories brackets for 1978 360

Thanks