engine rebuild? need information

I have recently come across an olds 455 and am thinking about putting it in a serious off road truck. it ran when it came out of the car that it was in, but i'm not sure what it will take to get it going again. I dont know much about oldsmobile motors, but i have heard that they are a good tough motor. I'm wanting to know if they are hard to find parts for, and if it would even be worth the time to use it. Also, is Advance Auto Parts a good place to get parts for them or not?
Thanks for any info.
Matt

olds 455's have lots of torque
which is needed for moving those tall tires
edelbrock makes intake maniflods and cylinder heads
theres this guy or place mondello he or they have a web site and lots of info