So what happens if you keep the old /6 rear end after 360 swap?

It's funny...the fastest vehicle I have yet owned only ran a 14.80 et, and most of them were mildly modified at best...but I still have manged to break a lot of stuff! Ah, youth...
The same 440 equipped D250 grenaded a 727 in spectacular fashion, a horrible BANG! and that case of pop bottles sound again...I think the over running clutch exploded.
At any rate, it wasn't pretty looking under the truck and seeing it bleeding ATF all over the place...the 727 came out in at least 5 ugly pieces, and that was what i could find!
I am a firm believer in blast shields now, after this fiasco. There is a reason the NHRA requires a blast shield on 727's and turbo 400's a second before any other auto trans, or at least that's what the rule book used to say.
Any T-flite is a grenade with the pin pulled, if the u-joints ever fail, or so say the good transmission guys. A u-joint failure under power can cause the over-running clutch to fail the next time you beat on it. A bolt in sprag is always a good upgrade at rebuild time.
Let's be careful out there!
alan627b