I agree with Eric, the cumbustion chamber has much more to do with timing requirements than rod length, in this case.
Mine is happiest with 31-32* total, 16 initial with 10 added using manifold vacuum, as tested on a chassis dyno.
Most aftermarket heads work well with 34-36* total. The Vortec style combustion chamber (not the E-tec) works with a few degrees less.
If you have a true 11.2:1 compression ratio detonation may be hard to avoid depending upon the camshaft. A DCR would be a good check.
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