Front backspace 17*8 on dart, final advice before buying

Hi sorry for another wheel thread, I have searched and measured alot but I still dont feel 100% confident so im just looking for some final help before pulling the trigger on a set of wheels:
US Mag Rambler-U111 Matte Gunmetal w/Polished Lip Finish Wheels | JEGS

My car is a 1969 dart with stock front kasley hayes discs up front. I will be doing the mustang rotor conversion so the mounting surface location will be the same as stock.

The wheels I want to fit are 17*8 inch with 4.5in backspace or 0mm offset. After measuring they will fit on the back with offset shackles its just the front I am unsure about. I am hoping to run 225-235/45/17 or 225-235/50/17 on all four corners.
Heres some set ups from the "post your wheel and tire" thread as reference. Hope you dont mind me posting your pictures and specs.


---I've got 17x8 on the front 18x8 on the rear back space is 4.5 on both with 225/45/17 and 235/40/18. Stock suspension no rubbing front or rear even with the torsion bars cranked down. Think I could go a size or two wider with no problems

---coys wheels 17x7 small bolt pattern 225/50s in front and 235/50s in the back they bolted right on with no issues great wheels 4.25 backspacing

---71 Dart Swinger Showwheels 17x7 Fronts (4.25 backspace) with 215/45's and 17x8 Rears (4.5 backspace) with 235/45's

---Here is my 70 Dart. The rear is narrowed to 56 1/2" from WMS to WMS. The rear is moved back 1.25". The wheels are Ridler 695's
18x8" in the rear with 4.5" BS
255/45/18 (27" tall)
17x7" in the front with 4" BS



Now Im not sure who has changed to lbp discs which should move the mounting surface out (1/2in??) but the first car has original 5*4in discs (which I read in a different thread) and the exact same set up so Im hoping if it works for him it will work for me?
I know that with these cars different people can fit different sizes due to production but this hardly applies to the front end? Thanks in advance for any help.

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