If you are taking it out anyway, I would update the cam. Talk with a Comp Cams, Crane, Lunati cam tech. A 406 can tame a hefty cam and that will bring out the power. If not that, consider changing your rocker arms to a 1.6 ratio for the extra lift and a few more degrees of duration. (Assuming your springs can handle it) But before that, make sure that the engine is balanced properly or there is not damage to the harmonic balancer. What flywheel/flexplate do you have. Internally or externally balanced ?
What coil are you running ? Plenty of spark energy ?
Rearend ratio ? Transmission/gear ratios ?
Any excess weight in the car you can get rid of ?
Just a few things to think about.
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