possible severe engine damage - would appreciate diagnostic advice

[BYprodriver]

I would call the dealership that installed the "new" engine & see what they say but I would not mention restarting the car the 2nd time. What alarms me is the smell you spoke of. When the IMS bearing seals allow oil to pass thru the seal to the bearing it washes away the "permanant" grease & the oil stays in the IMS tube & since this oil stays in the IMS tube when it gets old it smells very strong. My guess is your engine has jumped cam timing & may be hitting pistons on valves since it did not want to start like it normally does. Thanks for your great summary of what happened & a speedy recovery.