440 initial timing mystery

Hi guys so i just completed my build and broke in the camshaft. My engine is very weird it loves to have alot of advance timing or i might be wrong retard timing when looking at the damper which is a HTC-440 i see it likes 19-22degrees of initial timing no vacuum. I know my damper slipped since i checked tdc with a camera and TDC is at 10 so in essence timing right now is at 28-30degrees(-10 for slippage) its really hard to start and vacum is super low once started im pulling about 5 of mercury at 800-900 rpm (idle). i understand my cam is a bit loopy
Isky 280 mega cam Hydraulic.
(RPM-Range: 2500-6800
Value Lift Int/Ext: .485/.485
Value Lash Hot Int/Ext: .000/.000
ADV Duration Int/Ext: 280/280
.050 Duration Int/Ext: 232/232
Lobe Center: 108)

I do have a 850CFM carb with edelbrock rpm performer that are ported. Please help out is it normal for such advance? When i try to bring it down to something more normal it start to want to shut off. I have to increase idle to 1000 to keep it on