Re: Getting started
Welcome to the forum. You've come to the right place for help with your project. As for your choice of frames, if the Varsity is a 26" bike then you will have plenty of room for a engine. I wouldn't worry about the installation hurting the classic bike. Short of maybe a few scratches in the paint installing a kit will not damage the bike and it could be returned to original easily. Your expectations are not at all high and in fact quite reasonable. Let us know when you begin your project and especially if there is anything we can help with. Good luck; have fun.
Age and Treachery Will Always Triumph
Over Youth and Skill & "Charlie Don't Ride"