torque thrust ll 15x10 on step side

[930chef]

im having my 12 bolt rebuilt with new axles with 5x5 lugs.
does anyone know if the torque thrust ll 15 x 10 with 3.75 backspacing will fit a 1966 c10 stepside?
im sticking with drums on the rear, so the rear end measurements are stock.
If they fit, are 15 x 8 okay in the front?
thanks in advance for your help.

almost forgot to mention that the spindles have a 2.5" drop front and 4" drop in the rear.

kevin