As most probably already know, a Scirocco is basically a coupe-bodied Rabbit (ie Golf Mk1), basically identical except for upper sheet metal.
Engine is an "L2" (ie limited prep) VW 1.6, essentially an IT spec engine w/ new pistons, cam and valve job. Quite a bit of thinking but not terribly expensive to do. Engine started out as a BSI-built ITC engine that I bought from Mark Coffin. A good pro-built IT engine is a great starting point for an L2 Prod build as the pros (I'm told) flowed a lot of junkyard heads looking for the good ones.
As an aside, I do not think that the 1.6VWs are fully competitive at Road America with its long pulls, but I think they are fully competitive on an "average" track.
Al