New guy with a 66 chevy and questions

[jjaction1]

I just got my Dad's 66 Chevy stepside which was originally bought by my Grandpa in 1969. The original engine blew a week after my Grandpa bought it and GM replaced it with a new one cuz it was still under warranty. I uploaded some pics I took this morning at this website:
http://picasaweb.google.com/jjaction1/1966Chevy#


I would like to know what type of engine it has so I took some pics of some #'s on the side of the block. Hopefully somebody can help.

Immediate plans for the truck include:

1. Get the seatbelts replaced
2. Get a stock mirror for the driver's side
3. Replace drum brakes with disc brakes (5 lug)
4. New wheels and tires
5. Clean, Clean, Clean cuz it's dirty!!!

Any help in these catagories would be greatly appreciated, like where to find the best deals, etc...

Thanks for your help!
Jeff