Yeah if your van is a 95 it very well could have that crappy OBD1.5...but that is actually irrelevant since that computer wont be able to control the L67. If your state does no vehicle or emissions inspections, I would try to find a 93 L67 setup, which is chip tunable. The 94-95'* have not had much success as far as chip tuning goes due to bastardised OBD they have. Or you can go 96+ and OBD2 if you can find them in the junkyards...and if you do, try to get it from a Grand Prix since they share the same platform as your Dustbuster, and the torque struts will already be on the engine.
Welcome, downwardly mobile yuppies, to the dawn of the Age of Nefarious.
1993 SSEi - FrankenJinx - dead and gone.
1994 SSE (136K strong) - 180* t-stat,HD alternator, most unequipped SSE on the club, XM radio, Kenwood CD/MP3.
2006 Chevy Malibu Maxx LTZ - Custom 2.25" manifold-back exhaust w/FM-80. Probably the only Maxx with this system.