Wheel to fender clearance may be an issue.
The LBP 7.25 and 8.25 are wider than the SBP 7.25 and 8.75. The difference is made up with wheel backspacing, the 4" pattern wheel has less. Compare a SBP 5.5x14 Rallye with a LBP 5.5x14 Rallye, you'll see the difference. So if ou drill the 8.25 rear to 4" and use 4.5" wheels, expect to have less clearance between your tire and wheelwell lips.
Keep the 4.5" pattern, sell the 4" wheels and buy 4.5". You'll have a larger selection of wheels to pick from if you do.