the only differance in reason of 6 or 7 bolt is crankwalk and bigger rods. unless yer gonna make over 400hp then the bigger rods arnt neccessary, the lighter 7bolt rods will be more benificial. less rotating mass weight. Also crank walk risk, can be cured when you rebiuld a 7bolt that hasnt walked yet.

11.45@125,
stock bottom end 6bolt 2g head.
272 hks cams.
Holset hx35
Backyard biult!!