Re: 20x10 wheel on the front...
I'm guessing here based on trucks I've dropped.....
A 15x8 Truck-Ralley wheel would be about 4" of BS. That puts the outside edge of the tire close to the fender opening/lip @ anything more than 4" of drop w/an average (for a truck) size tire @ 27-ish inches tall. Shorter tires yield more clearance but don't look 'right' (this of course is subjective).
So, given that as a starting point, you would need to go w/additional BS for wider wheels. On a 15" wheel you'll run into issues immediately. The 20" wheel will allow for additional BS but will still hit the a-arm once you exceed the 5-5.250" BS mark so trimming of factory arms will prob be required.
What 20" 'autocross' tires are you planning?
What will the suspension set-up be?
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