690 is really tame for a 8-71 on most anything.
I'm at 550+ with a "mini" blower and 200*intake temps and pump gas.
That thing should be 800 + with a very conservative tune.
Loan it to me and I'll send it back in a bucket....LOL

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70` Cuda`,440 6BBL Jerico,Dana 4.56 Still on 93 Pump Gas
9.87 @ 136/1.31-60ft.`09 Mopar Nationals PASSON PERFORMANCE "Stick-Shift" Champ!
2013 StickShift Challenge Winner@ Mopar Nationals!