Start out with a 4.56 ratio rear end, and maybe you'll need to go a bit lower- - -possibly a 4.88. Get used to running the engine at or above 3K RPM all the time. If I were doing a dyno test on an engine with that cam, I wouldn't bother making a pull below 2500-2800 RPM, and I'd expect the peak HP to come in somewhere north of 7K. Below 3K or so, it won't make enough torque to get out of its own way. The name "Thumper" on the cam card should give you a clue what to expect. If you're planning to pair the engine up with an automatic transmission, use a torque converter with a stall speed around 2800-3000 RPM.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!