Very interesting. I heard of US spiders changed to T-spark with used engines from Italy. As a matter of fact there were two for sale on eBay last week.
I think the conversion involved keeping the electronic fuel injection from the t-spark (no carbs) The engine could not be mated to donor car 5 speed so a transmission from a maserati biturbo was used.
I'm skeptical of the fact that this is a "factory" option or that it was made in the "factory" If that was the case why not make ALL the spiders with those sweet t-spark motors?
Other than the "factory" statement I see nothing wrong with having a converted spider as long that you can register it and smog it. I'm not so sure you could pass a visual inspection not having a Cat, at least here in NJ.
Could you get us some pictures of this? we love pictures in this BB.