If u want to build an 86 i would go for it. Not trying to smack talk but what Dutch said but that is what the Honda/Yamaha guys say about the Suzuki 2 strokes in general since those engines have larger aftermarket and make more power easier plus very reliable. Where the its a will their is a way. Only problem is that the way u choose can be very $$$. I would contact some of our engine builders here and elsewhere to discuss your project and see of they want to help make it happen. Imo if u are trying to build any LT250/500  u are already building something that isn't "worth it" but that is also what makes it fun and unique.