69f bird,
I run a chevy 12-bolt in my 69 bird, it has not given me any problems. I broke an axle in my origional 8.2 this past spring, but the u-joints and drive shaft have held up. I had to install the two sized u-joint to mate the chevy yoke to my Pontac driveshaft. I also use the Moroso aluminium caps, instead of the strap style method. You can get heavy duty joints that are pre-greased, they do not have a hole for the zerk fitting, which makes them stronger. Also make sure when you install a joint with a zerk fitting, install it so as to stretch the zerk fitting, not compress it.
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1969 Firebird, Tx3-455/468 machined by CVMS
E-heads by Dave Wilcox/Comp Cams 300B-6 flat solid
850DP on E-85 by Eric Niefert/T2 1" plastic spacer
T-400/PTC 4000/390's/30x9 Hoosier radial slicks,#3400
1.38 60' 6.32 @ 108 MPH at Northeast Dragway NC 5/23/15 (9th pass on new engine)
https://m.youtube.com/watch?v=ePCu2v...ature=youtu.be
1.37 60' 6.26 @ 109 half track, 9.86 @ 136 1/4 mile, #3350 11/26/16 at Richmond Dragway (125th pass on new engine)
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