I ran this one in my 454 +.030" over, 781's Vic jr, O.T. Bassetts, 9.7:1 motor, It ran hard, 52-5300 with an 'A' impeller:

http://www.summitracing.com/parts/cca-11-324-4/overview/make/chevrolet



In my cruiser, a 'lil hyd roller (another 454, +.030" over, 427 truck heads, logs and snails, 9:1 motor) 4900-5000 with a 'AA' Impeller:

http://www.summitracing.com/parts/hrs-cl120245-12/overview/make/chevrolet


And you have a few more cubes to work with. 
This is only what I have done...there may be better choices out there.
Still have the headers?
What Intake?

Dan'l

I'm runnin this cam
http://m.summitracing.com/parts/hrs-120665-10

My combo
454 std bore
10.5 compression
Ported 781
2.225 1.88 valves
Tunnel ram
2 750 holleys
Runnin. Bassetts dry
Hopefully try it out when I  get home from this hitch at work