Disc Fitment help '73 Duster

Goal: I want to install a front disc kit.

Just picked this car up and I know very little-- Getting a little confused on measurement differences between 73' Dusters with discs and drum.

Originally a 1973 Duster w/ 225 and drum brakes
Currently has a 360 and I'm going to give it a bit more power -- street build.

It has has American Racing wheels - AR172 Baja
Which I believe are size: 15x? (7,8 or 10) pattern: 5x114.30
I dont know the offset or backspace because I cant measure the width of the rim.

I read that this kit is good, but will it fit? What other measurements factor in here...
PLYMOUTH DUSTER Wilwood Forged Dynalite Pro Series Front Disc Brake Kits 140-11023

Thank you for any help.
Ben

That's the kit I have on my '70 duster installed fairly easy WELL worth the money spent:thumbsup::thumbsup:..