If he can measure the other bolt pattern to confirm it is indeed 5x5, that's a start. The F-150 wheel hub bore is 87mm so, that's also good since it will fit over the B-body hub (Assuming he's not running an adapter and the wheels are bolted directly to his truck).
Wether or not they will fit without rubbing depends on the offset and width of the wheel. From my research, they should be 22x9.5" and have an offset of 10mm or 40mm. See if you can get the offset and that'll insure fitment. 10mm is fine but, 40mm is way too high of an offset and will cause problems. The tire size is just fine for the B-body.