Preflop hand selection when facing a raise

[J.Copperthite]

A gray area in my LO8 game has been how to play raised pots. I like to think my flop play is good so I am sometimes lenient in my hand selection in late position when I can limp in (3 wheel card hands, double suited pairs w/ 3-2 or 4-2 lows, etc.). However, I still don't know what kinds of hands I can call preflop in a raised pots. Are there any guidelines I can use for this?