If you had the choice which would you choose?

I say 833 OD. I'm not a big fan of these---there seemed to be a lot of 'em that wore out early and started 'falling out of gear' 'specially in vans and pu's, but......

You could build an 833 OD, stick it RIGHT in there and save your original 4 speed "as is" if you want to spend a summer drag racing.

Much easier, much faster to install, and a hell of a lot cheaper

Of course you can't impress your buddies with your new 6 speed, but then, THEY didn't pay for it