So ask yourself what is easier/better. Bolting everything on the engine, getting some skilled help and slide the whole thing in complete with no damage.

OR, you can put in the bare engine and bolt everything on in the car leaning over the fenders.Try your best for the next 2 days not to scratch anything and get it all sealed up and leak free while assembling this in the car.

How are you going to get the orange overspray on the exhaust manifolds and fasteners while assembling it in the car??

How are you going to get those exhaust manifolds bolted up without scratching anything? These are large and heavy and they mount with bolts that point down to the floor, you can just slide them over a stud and have them stay put like any other Mopar V8.

It is not vey hard to install the complete engine in the car with zero damage. Lube the wheels on the engine hoist, get on a flat smooth and swept concrete floor. Have a skilled and physically strong person helping you. Have good lighting so you can see what you are doing. Don't be in a hurry. It works just fine.