My Demon 5.7 hemi carb swap

Read this :

A warning about spark tables

The new Hemis neither need nor appreciate a lot of timing advance. We've found that 22 degrees at full throttle is all the advance one is likely to need on race gas, and can be too much on pump gas. The default MS3 timing table is for an older combustion chamber with a much lower flame front speed, and needs to be backed off before you start tuning. I'd start with no more than 18 to 20 degrees at full throttle (100 kPa). I've heard Mopar faithful comment "This engine isn't a real Hemi" - and they should not be tuned with the huge amounts of spark advance a classic 426 would have required. The newer head has a much faster burn rate and is considerably more efficient.

From:
http://www.diyautotune.com/tech_articles/how_to_megasquirt_your_new_hemi.htm