7 1/4 Vs 8 1/4

i would just measure everything before you do the swap. measure from the axle flange to the spring. or about where the spring would be if you cant mount one. then lay a straight edge across the tire and measure from that edge to the back of the rim, where it meets the flange. that will give you an idea if it will work. or mount the wheel on the 8 1/4 and see how close it is to the spring perch.