Why not go with an M20 flywheel? The swap is well documented and def cheaper than $500 for that kit.
Pm me if you have questions. I also have an EXCLLENT condition flywheel for sale 
Hi Ken
I saw your flywheel today and it took all my willpower not to just buy it from you on the spot. You see, there are many discussions about the M20 flywheel conversion, and I'm thoroughly confused. If you can clarify the process, then I'm very interested. I'll PM you.
Ron