It would be a very good race anyway you look at it.
Power-wise you 2 are going to almost the same.
Boss (Roadrunner) stock = Coyote w/ tune horsepower wise.
Noone mentioned that his Boss is going to have a little lower & stiffer suspension, which will probably give him a slight edge.
However, since you're both manual, it would be purely a drivers race with the 2 cars being so equal on almost everything.
I weighed my wheel/tire combo's before/stock vs after/TSW+Mickey Thompson.
I save about 5 lbs per corner on the front & about 4.5lbs per corner on the rear. (stock was square, TSW's are staggered so rears are heavier)