need to learn about camshafts....
First read this
http://www.hotrod.com/techarticles/engine/hrdp_0804_small_block_mopar_engine/viewall.html
Then
http://www.hughesengines.com/TechArticles/5basiccamguidelinesformagnumlahydraulicrollercams.php
The combo you have may be real close to what you want.
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