Use the specs that Daze has on his site(found on here in a couple spots)
More importantly for on/off ramp fun you need  a 1" sway bar...one piece export brace... and a Monte Carlo bar to stiffen up the front suspension  SUPPORT area. This with the "Shelby drop" will make it handle like its on rails. No kidd'in!
6sal6

X2 on the 1" front sway bar and bracing.  Going to need subframe connectors if you want the handling to be precise. 

Handling on a 15" wheel is going to be somewhat relative, especially with the tire selection available currently.  A 16-17" wheel will give you a lot of good and cheap options for tires and will hold the road a lot better due to the reduced sidewall. 

I'd also advise keeping the springs that are in it, though 4.5 leaf rear springs can help with axle wrap if its an issue. 

I run 16x7 steelies w/4.25" back spacing.  There is room for the ball joints (~1/16").  You might be able to use +- 0.25" on the BS depending on your wheel, and how your suspension is set up.  The wheel configuration at the mounting face area, and the design of the wheel drop out sometimes interferes.  My issue is at the inside rim edge aginst the caliper.  There are so many variables that you must test fit your wheels.  I also have 12.19" rotors - Willwood-If you have smaller rotors you might have more space.  Again - Test fit before you buy. 

Last edited by lowercasesteve (7/20/2019 8:44 PM)