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For a 400 with those miles I'd be happy though.

X2, run it! Leave the long block as is. Tweak the dist (initial/total/springs/vac adv) then the carb. I'd suggest HP ex manifolds/mandrel bent ex system as the ex system is the most restricted part of the "air pump" (the eng). different cam maybe

live every 24 hour block of time like it's your last day on earth