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    71 Duster Timing

    You can buy light springs We run vacuum advance to straight manifold rather than ported and that really helped my son's 340.
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    lets revisit timing

    As a rule of thumb on my Stock Eliminator cars I pick up 1% for ever degree of advance until you get to much and I start laying down in last few feet. As Altitude and Humidity go up I can run another degree for ever 1000 ft or 10% Humidity But you must be rich enough on you jetting!! When these...
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    Disappointed magnum head flow numbers....

    My vote is to go with Aluminum Heads. Porting the old Iron Heads is expensive and not an easy Do it Your Self Deal if you do not have extensive experience!