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Since I have been pondering the same thing and doing alot of research, you are better off changing the cam too! The cam in the motor, if its truck based, is very weak and low end torque based. It will not be able to take advantage of the new heads. They will be providing a ton of flow that will go no where since the cam wont let it happen. You could change the heads, but when you change the cam to a roller, you are going to need to new lifters and pushrods, which will force you to remove the heads, so you might as well do the whole thing at once.
Best of luck,
Bignoze
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