318 roller motor

I recieved a low milege 318/904 out of a dippy, My question is can i change the cam shaft back to a hyd tappet cam, or am i stuck with the roller set up. The heads are #302 still with shaft mounted rockers. I just wanted to change the cam , add a 4 barrel carb and set of headers, for a friends car (he doesnt have much money) and want to use the 318. Has any on used the stock roller cam with 4 barrle and headers?

You can change it back to flat hyd if you too. Is there something wrong with the roller cam?
I think in the long run you would be better off staying with the roller due to the zinc levels in the newer oils used today.
And yes you can run a stock roller cam with 4 barrel carb and headers with no problems.