Yes you can. I didn't do that on any of my swaps, but it's definately possible. The biggest concern is the use of tall valve covers. They will not clear if you retain the heater-a/c box. You'll have to use stock, or close to stock height valve covers.
Most any oil pan will work, and there will be some slight trimming to your driver side motor mount if you're going to use the Hooker SuperComp swap headers. You'll also want to be cautious of your brake lines if you use those headers (I found that out the hard way). Just a few FYI's, but if you have any other questions, hopefully I can help out.