The Difference in the 8* duration @ .050 will be far greater then the 1* in LSA

But, 1* tighter LSA is on the bigger cam, witch normaly increases overlap.

But, not in this case as the smaller cam installed stright up @ 108* ICL will not open the intake valve untill 1*ATDC The exhaust will close at 1* BTDC So theres a 2* spread from Overlap "EDIT Stated @ .050 dur."

The bigger cam will have 8* overlap vs none of the smaller cam.

At the same spec ICL the 222 will close the intake valve 38* ABDC vs the 214 @ 35* ABDC

Of the two I dont know whitch one Id pick. Probably the smaller one because you said 3900# and towing. The bigger one would would most likely work just fine too mike