I am replacing my greyhound engine which has a TAV... for a brand new Predator 212 hemi. I just want to throw on a new clutch and continue to use the 420 chain that fits the rear sprocket. I considered using the old torque converter, but I was not sure if the built in key was compatible with the Predator. I am reading that the clutches accepting a 420 chain are 10T. I need some guidance, and links to the appropriate clutch for my Manco 573 (?). Thanks OldMiniBikes.