I had one in a 68 Dart behind a 440 and it held up to daily driving for 3 yrs.

but I drove it like a GranMa all the time. pulled the 440 and went 340 and then hammerd it for 2-3 months then spit the spiders out the cover doing a 1 wheel peel for 2 blocks...BANG!

it drove well and would ride like the wind on the interstate but I never spun the tires with the 440 like that.

do what you got to do to keep from walking IMHO,just remeber you are never far from walking if you hammer it.