Hey, Alex, I got one of those a week or so back, too, and I don't really have any fear of running it behind my 340. With more displacement and not THAT much more weight, I don't think you'd have anything to worry about. Nice thing about those flywheels is they're drilled for 10.5 and 11" bolt patterns. you could run a 10.5" clutch and shifting would be super slick... less mass for the synchros to control, so they'll work better.
