I agree with the aftermarket front drum ! Had a 383 nitrous Motor in a 67 Valiant and the transmission got weird on me shifting funky and slipping . Long story short the front drum was cracked on the back side all the way around with maybe 1-2" holding it together .No stock front drums for me anymore . Luckily I dodged that Bullet . There's stubborn people out there that wont upgrade them. It's just a matter of time until a rude awakening .