[xb-60]

Correct, Gary. I think a "kerbside" noise test and a CO2 test are all the testing that is required if the engine is to standard/unmodified spec.
Can legally change the engine spec. (carbs/cam/heads) afterwards but would need to undergo the full IM240 test routine....hence the interest in piggybacking on the street rods freedoms. A lot of work to be done to achieve that though!

Cheers,
Glen