I'm not running a scatter shield but,,,I probably should be. Also a drive shaft loop.
I have my motor pilled at 7K. I have hit the limiter on occasion. The Zoom clutch I had earlier had some vibration that concerned me. My current Center Force runs smooth as silk. I take my car out on occasion to GLD but mostly it's street driven. (after breaking the motor 2 times it was getting expensive) When I pull the motor next I'll probably get a scatter shield. I have a DS loop to install but just haven't had a chance to get it in yet.
I'm not going to say you don't need the scatter shield but 5500 isn't what I would consider too much. But if you build the motor more then I would definitely recommend it.
My block is a 79 Chevy truck block with 2 piece rear mains. I'm running the stock flywheel that was resurfaced at Kilpatrick. (I think it cost me $50 to resurface) I would be leary of the Jegs flywheel if it's Chinese. I've seen way too many brake rotors fail to trust something like that in my motor. You could probably get a flywheel either off Craigslist or the junkyard in Sussex for cheap.
Now with all this being said my car is 2900 lbs soaking wet with a tank of gas. Your 57 is considerably heavier so you should take that into consideration.
Jim Kilpatrick and I did a bench build to come up with specs for my motor build and clutch selection. I told him I wanted a lopey motor that will run on premium, streetable and hold it's own at GLD once in a blue moon. He ordered the parts and machined/clearanced the block for the stroker kit. I had him degree it as well. I took the rest home and assembled it and stuck it in the car. I have 4500 miles on this motor right now.