The 455 is a smooth, powerful motor, and these were pretty nice cars. While it’s likely to need more than hoses—possibly carb work, belts, all fluids flushed and changed, and the suspension and steering fully checked out, it’s also a classic, and is probably worth some $$ if it’s in even fair shape. Expect more like 10 MPG. If it has drum brakes all around, expect pretty miserable braking performance.
This car will likely require more maintenance than a new vehicle. You will need to regularly adjust the points, for example. The car is very simple though, and should be easy to maintain. The only electronic device on it is likely the radio. I would keep it out of the salt and snow—cars of this era were not rust proofed nearly as well as modern cars, and will noticeably rust in just a couple of years.
Congratulations on getting a nice car!