timimg issue

I am running Keith Black flat top pistons. I assume te compression is about 10:1. The distributor is an accel and it has a MSD 6AL box. I just put the 3:23 gears back in it.I dont have a tach but I am guessing that around 3000 -3500 RPM the engine shakes more that it should is why I know the timing is way off. When I am running it and get down on it it falls on its face and kinda backs out some.