James,
There is no reason that a 2.2L or 2.5L Suby engine would not pass emissions if is left in stock configuration and tested by the standard of the year of manufacture of the engine. It is my understanding that the EPA takes a dim view of modifications by a manufacturer/assembler of modern computer-controlled engines. For instance, the exhaust system must be unchanged from the exhaust header back through and including the catalytic converters. Fines up to $50,000 per unit can be assessed for non-compliance. Off road vehicles (eg. sand rails), I imagine, would be exempt.