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Tom,
I think you have been given some very good advise especially with the Ross pistons, alum H-beam rods, solid lifter cam 600 lift/ 250 dur, roller rockers, heads, and intake will be your fastest way to HP (don't scrimp), do it right. MSD is always a good way to go.
In my opinion you don't need the 4.57 gears. I would go with 3.50 and not more than 3.73. You may want to find a good toploader or TKO 600 tranny (the T-5 won't last). The 390 is a good work horse and should make you very happy.
Clois
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