Comp Factory Muscle cam for bigblocks, it's like a revamped 440HP camshaft, should slot in with no other substitutions.
http://www.jegs.com/i/COMP-Cams/249/CL21-305-4/10002/-1

It's a little hotter than the Crane 680101 Factory Blueprint camshaft, the Crane has lift and duration very close to stock but the lobe profile has been smoothed out using computers.

Lunati's Voodoo series the 10230700 is actually smaller than the factory HP cam, the 10230701 is nearly identical to the factory HP cam but with modern lobes that will get more airflow.

Last but not least I'd suggest the Crower 267 HDP. It is a tiny bit bigger than the other three. It seems to be a very satisfactory camshaft, we have gotten good reviews on it.

The 271 HDP and the Summit larger cam are too big, the summit smaller cam is too small. The four cams listed above should meet your needs and not make your car undriveable with stock drivetrain.

Good Luck!

R.