Timing for my engine

[Petri.]

Hi,what would be the best timing for my engine and how do i check it with the strob lamp,do i need to take the vacum line away from the ignition,long time ago i did timing on old cars,this is my setup.

Block Hi-Nickel Content (not original block)
Bore .030 over
Mopar steel rods
Keith Black 9.0 to 1 comp pistons
Moly rings
Clevite 77 main & rod bearings
Forged steel crank shaft
Complete balanced assembly
Cylinder heads (906) large valves with hard seats
Valve job with comp springs
Comp hyd cam 272 degree x 480" of lift
Cloyes dbl roller chain & gears
Melling high volume oil pump
Intake manifold is a HP 383 with Edelbrock 800 cfm mod #1412 4 bbl carb
Pertronics electronic ignition with MSD coil (no points)
Exhaust is a 383-440 magnum HP manifolds

/Petri

[greenpigs]

Plug the vacum line.

You should go for the most vacuum your motor will produce & still start easy without pinging.