1957 was Chrysler's best year. The most coveted model was the 300C convertible, but the Imperials are very nice also. I believe your model had those "gunsight" tailamps, although in 1958 they got even more impressive with partial chrome rings sticking out on either side.
As for the motor... you'll probably need to have it completely rebuilt. It's not all that difficult... once you have the space and the equipment. I have a '50 Plymouth with a seized motor. It's been parked for 10 years (I also have a '50 runner that I rebuilt), and I recently picked up a relatively cherry '50 motor, complete, that I could pop into the non-runner. I rebuilt the first one myself, first time I've ever done more than maintenance work on a motor. It was quite an experience. Took me a month and nearly changed my life.
I like Chrysler cars - their engineering always seemed to be superior to GM and Ford, even if the manufacturing sometimes fell short.
As for the motor... you'll probably need to have it completely rebuilt. It's not all that difficult... once you have the space and the equipment. I have a '50 Plymouth with a seized motor. It's been parked for 10 years (I also have a '50 runner that I rebuilt), and I recently picked up a relatively cherry '50 motor, complete, that I could pop into the non-runner. I rebuilt the first one myself, first time I've ever done more than maintenance work on a motor. It was quite an experience. Took me a month and nearly changed my life.
I like Chrysler cars - their engineering always seemed to be superior to GM and Ford, even if the manufacturing sometimes fell short.