Timing and idle

Hello! Newb question here but I just need some clerification.

I have the timing on my 71 demon 225 /6 set at about 2 1/2 BTDC, idle at 750 and the points at .020. This is factory spec according to the book I was looking at.

It is running rough and wants to die at stop signs in drive. Placing it in reverse will kill the engine and I have to restart and then it will let me go in reverse but not without crying and atempting to die again.

I'm thinking the car will be better at around 6 BTDC and will attempt it later in the week. As far as the idle goes is it ok to have the idle around 800 or so even though the factory specs is 750? What is a safe idle range for the 225 /6?

I have tried to look for more info on the timing and idle range of the car but have yet to find any decent information. If anyone can point me in the right direction I would be greatly appreciative.

OR if you think something else might be wrong please feel free to throw in your opinion and I will definately look into it.