The series 2 had the big block 427 Chevy. I know the Wikipedia page indicates Clevelands were used but I'm not aware of that and it seems inconsistent with the use of Chevy's for both Series 1 and 2.
Love the look of the Series 1. Sadly, like so many cars of this era (Alfa GTA, Ferrari 250GT Berlinetta Lusso, Lamborghini Miura) this car has escalated out of my price range...