I did exactly as Frenchtown Flyer suggested. A guy in Georgia, who used to work for Reed Cams, fed my info into his computer, then ground my Chevy II/Mercruiser 181 cam and it works just like he said it would! Great! If you'd like to talk to the guy, e-mail me at drh@digital-link.net and I'll hook you up.
My cam is a dual pattern duration (252 INT, 264 EX) with lift (.502INT, .525 EX) The engine idles fairly smoothly and revs quickly, producing plenty of low-end torque. I've got 3/4s of a six cylinder Chevy... which is a 4-banger, with two progressive two-barrel carbs, headers, raised compression and HEI ingition, so your needs may require a different profile.