Yup... Slant 6 Clutches... That's what they pretty much were... After blowing apart more then a few of them... I now run with the 340 Bell housing, flywheel and clutch assembly on my 65 273 Commando "S"... And, ain't had no problems since... and loving the hard launches!!! (now and again that is) :burnout:
And back then (mid to late 60's), running in the 15's seemed pretty fast... but keep in mind, we all ran on some pretty "skinny" tires as I recall (compared with today's wider tires/wheels and today's rubber compounds)