Mine is too!! Only thing I do different is a better clutch and steels. I have run stock clutches before, no problems, They work, Only way your 340 will hurt that trans is if the trans is already worn out. The Wheelstand pic was to show you what they will take and keep on going. Besides you will pick some power going from 727 to 904, usually 1-2 tenths in 1/4 mile, like a free 20-25 horsepower gain !!