I just took measurements rear 26 1/2 with 215-75-15 the top of my tire is aprx 1-2”above the rear fender lip . That could be off because I’m not 100% level , side to side .
That spring does look alot flatter than mine . What angle are your shackles at ? I see you have tube shocks , nice . I just went through a week of r&r rear shocks , adding correct oil , adjusting, installing new links etc . Tube shocks are so much easier .