5.0:4

A friend of mine was cleaning his garage and stumbled across a PG 5.0:4 and is willing to offer it up as a freebie since he has no use for it. The dilemma I'm facing, though, is that I'll be setting up a front stage only (running on passives) with a ID10 d4. Since the 5.0:4 is only stable to 4...