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I would look into a Cam Motion LLSR...we just put a 244 254 .63x .62x 110+4 in my Brothers 383 LT1 today. Sounds Amazing and very crisp throttle response.
The cubes will eat that duration, considering he has a relatively high SCR, the added overlap will help bleed some of that off and still have a tolerable DCR for 93 octane, unless OP goes e85 or higher octane fuel then he can probably run an even higher dcr. Then again, it also depends on quench. The engine could have low static compression, but inadequate quench and would result in a lower timing window, and less performance in comparison to a high compression engine and adequate quench.
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Another "what cam" post. 
