ATK motors

[70SS454]

My 454 motor finally gave out after 35 yrs. I have done a lot of research from performance shops rebuilding my motor, to individuals, to remanufactured motors. My 454 needs to be bored 60 over to rebuild and basically needs everything. I am prob going to go with roller cam set up with some upgraded internals but not looking to ever drag race my car... Just cruise, get on it now and then and the occasional fun burn out. Prices are all over the map but basically $4000-$7500 for what I am looking for. My motor is not a numbers matching motor so I have thought about buying a 454 from ATK motors. Actually from their performance side, gearhead motors. It's a long block roller set up with a little more than 450 hp and more torque. Still a mild build.
I have already pulled the motor and it is rebuildable. Still a mild build.
I believe they sell these motors at summitt also.
Has anyone here bought a motor from them and what was your experience??