On Saturday, September 19, 2015 at 2:24:39 PM UTC-4, wrote:


Spot checking of modified vehicles at large "car shows" has been
promised, and reported. Just because your car is registered as a 1927
model "T" ford does not mean it is exempt from emissions testing if it
has a 2009 Chevy LT between the frame rails.

Officially it needs to meet the requirements for the 2009 vehicle the
LT was originally supplied for (determined by the engine number).


Depends on the state. In CT, the car only needs to pass the test for the year the car's VIN indicates, assuming they test old cars (CT doesn't on cars earlier than 1990).