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What harmonic balancer should I get for my GM 290hp crate engine? I think I am supposed to use the 6.75 inch internal balance one but I am unsure. Also, how do you attach the timing tab? I epoxied the one on my 307 and that worked fine, but there's got to be a better way, right?
 

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I used the 6.75 internal balancer on mine and an aftermarket timing tab.
 

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If your engine part number is 12499529, it is internal balanced.

The following came from pages 36,37,38 of the GM performance parts catalog. You can get the catalog at the GM dealerships for around $5.00

It indicates the following:

Harmonic dampener - PN 12551537

Auto Trans flex plate - PN 471529

Std Trans flywheel - PN 14085720
 
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