"I think it will be silly quick with the rossi up front,"

It will be quick indeed. My first trainer - a fairly rough Eagle 2 -had the fist engine I bought... a used YS 45. It was sort of like learning to drive in a Chevy pickup with a Ferrari engine in it. I do remember the time I brought it into the LHS and heard the comment, "Whose is that and what is THAT ENGINE doing on THAT?" Let us all know how it flies. Good Luck!! Doc