Ftyler,
It can be done easily at home if You have a press. I did this several times, no problem. Just put cam assembly in the press, make sure the cam plate is adequated seated in the press stands and do it. To assemble it back You can even heat the gear or press it back. No big stuff. And our fellow Tony is completely right, the aluminum gears out of 250/292 of the pointed years do fit the stovebolt.
As for the noise, just one comment: the later gear out of the 250/292 has the same pitch and teeth measuraments as the early 235/261. Just like the fiber gear thatr goes on the 153 Nova engine. Here in brazil we use to have a "special" timing gears that were used in the 250S engines, a high performance local version, and these gears have a diff pitch. Looking at the stock gear, it has a small surface that looks if it is still a part of the external circunference, and the performance ones seems to have all teeth with a sharp point. So if You mix the wrong ones, a weird noise will happen, not to mention that a big lash will be there. I see no need to swap both gears as long as You are sure about the type You have.
