360 Advice Needed - Autocross / Street Engine Build

For the cam, I had gone with a split pattern to try to help with the exhaust restriction.

Looking at the cam card though, it seems to have a pretty slow ramp compared to other:

Comp 275DEH:

• Advertised Duration (Int/Exh): 275/284
• Duration @ .050 (Int/Exh): 219/235
• Gross Valve Lift (Int/Exh): .462/.482

Looking around at other similar cams, I see Lunati's version:

Lunati 10200704:

• Advertised Duration (Int/Exh): 276/284
• Duration @ .050 (Int/Exh): 234/242
• Gross Valve Lift (Int/Exh): .513/.533

This has far more duration at 0.050", so I would assume a much steeper ramp.

How much larger on the camshaft would you suggest as a starting point?
And does the longer exhaust duration make sense?


Thanks,

Ryan