Idle speed question

I have my idle pretty clean as of now. It just wants 1150 rpm. The cam is big, 243/259 651/651 112 LSA. 27 degrees overlap. With the super victor intake and FAST 4150 throttle body do I have a chance getting it down to 900? It will idle there but bounces around a bit and stumbles. I am travelling for work today and don't have the log to post with me. I have timing in the idle areas set to 18 advance. Any lower and it is real lazy. Any higher and the overspeed has to keep pulling it down. The best I can get vacuum wise is 5 lbs at idle and that is at 18 degrees.
https://youtu.be/zgNHu_pr5JM