13's, stock '71 318 short block.

I am running almost the exact same combo. 73 318 flat top pistons w/valve reliefs .060" in the hole .028" head gasket. Stock magnum heads, beehive springs, Comp XE256, crosswinds intake, Holley 4160 600cfm, Hooker comp headers. 904 with shift kit and 3,000 stall, 3.89 gears with detroit locker and 29" drag radials. I am pretty happy with the combo, but it has not been to the track. It will work until I get enough funds to finish my stroker build.