Will any SBC balancer, except the ones built for externally balanced engines, work on the DZ 302?
Thanks

yes, but it won't be "correct".

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1971 Nova(looks like 69 camaro from underneath!)
355sb, vortec heads, HOT cam,T-10 tranny, 3.70 gears 16X8" IROC wheels. 12" Corvette brakes on the way.
see dirty pics here of a car that gets driven http://community.webshots.com/user/novaderrik

And if it isn't a '69 or later balancer, the index mark won't line up with the "0" on the timing tab at #1 TDC.

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JohnZ
CRG
'69 Z28 Fathom Green

What is the exact degree difference between earlier balancers and the DZ balancer? Is it a 10 degree difference?

It's not just the DZ balancer - it's ALL '69 balancers; the index mark was moved about 9 degrees counterclockwise due to the long water pump accessory drive system, and the timing cover also changed so the tab moved counter-clockwise to match the balancer. Any time you see a post like "I Can't Set My Timing" or "My Timing Mark Is Off The Tab", you can be pretty sure it's a wrong balancer/right cover or vice versa. Between the pre- and post-'69 balancers, different balancer diameters and thicknesses, there are lots of different timing covers (plus all the Taiwan chrome ones), and I see lots of them that are mismatched.

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JohnZ
CRG
'69 Z28 Fathom Green