Do you have long tube headers?

If you are going to do a cam swap you will need at a minimum:

cam
hardened pushrods
gaskets
valve springs
should also do rockers
Considering the mileage, a new timing set
and a good tune.

Your gains will not be that great unless you also get good heads and headers/exhaust.

Be ready to spend the money to do it right the first time, a grand isn't going to do it.