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I couldn't find a chart on Comp Cam's web site that compares rocker lengths but the duration of a cam is measured at .050 valve opening and a longer rocker will reach that opening slightly sooner when opening and later on the closing side so that will change the effective duration slightly but not significantly and not enough to affect low speed torque which is what you are looking for.
RE your fibre gears:
Chevys have a nylon cam sprocket which wears over time. I have an old motor from a 74 Nova that was so worn that the loose timing chain wore through the timing cover but the motor kept running and is still running.
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