Jim LeHart (Mr P-body) has had very good sucess with the 290-b solid flat tappet cam. His recipie in 6X-8 heads with Comp Magnum 1.65 rockers is 150 seat pressure at 1.600" installed height, 340 lbs open. Valve size, 2.110"-5.095" long.
A fwiw, if and when the time comes and you change push rods and are using 5/16" upgrade to a thicker wall section rather than the typical .080"-.083" diameter. Manton 0.118" wall is a good one. Also Smith Brothers.
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