Not knowing anything about your combo...I'd consider this one...
PLYMOUTH Howards Cams 718001-09 Howards Cams Rattler Camshafts | Summit Racing
With a mild combo it will be a little soft on the low end, but from a 20/25 mph roll, it'll pull like a bear to 5500/5800.
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Just saw you had a id thread for a DP Holley and notices you have PB's. As long as you can run a good timing curve, the above cam should work fine. I'd speculate 10.5/11.0" of vacuum should be available with a minimum of 14/16 deg. initial @ 850 rpm idle.
Yes, i'm just throwing out some thoughts...:)