In the end, it comes down to you calling and talking to the tech guys at your favorite cam grinder. Their service in selecting exactly the right cam for you is free for the asking. I was simply trying to get you to come back to reality a little and spec a slightly smaller cam for yourself. It's always better to undercam than it is to overcam. When you install a hotter cam in a motor, you are moving the operating range up in the rpm range as well as providing more time for the valves to be open. Again, with a stock converter and a 3.08 gear, you will want to be a little conservative with your cam choice. If you overcam it, it won't have any bottom end power and I hear you saying that is what you want from the motor. Call your favorite cam grinder and I think you'll get a recommendation pretty close to what I recommended.

You should be able to make 300 hp pretty easily with most any 350 that is put together with care and paying attention to clearances.