If I read the specs right, you have an 8" converter. Screw the "curve" - you don't need an ignition curve IMHO. You flash way past any curve. I'd lock out the timing and and just start moving it in 2 degree increments. Run three passes in the same lane to get a feel for the change. That cam should probably be shifted in the 6400~6800 range.

Use a start retard to help crank the motor or switch the ignition off until the motor reaches cranking speed.

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1967 Falcon 4 door 351C - Owner built, owner abused.
70 Mustang 351C / 06 Ranger, 04 SuperCrew parts hauler