What you gain adding a cam

[Labrauer]

https://www.facebook.com/reel/1967075043627335?s=yWDuG2&fs=e&mibextid=Nif5oz

[Sniper]

Tim Kingsbury does a pretty good review of cams for our engines. It's on this site

[Plymouthy Adams]

tread carefully here as the main thing folks overlook in performance cam installs is that the power on tap at the speeds the engine will see on the street causes for a loss of actual HP on tap at these speeds over stock, so for street use, many often lose.  Now driving like you stole it, holding gears longer and keeping the engine in the upper RPM you now will see and feel the addition power.  The trade off is not worth it if you do not push the engine....cam change is all about your intended use of the engine...at what levels will you be using the vehicle.....however go radical with the changes and lose all around, moderate change will net you some improvements on the upper end performance and still allow street use without harsh idle and low speed lugging.  

[greg g]

There is also a 50's magazine article, in downloads area, detailing the changes in hp gained or lost with changes in cams, compression, exhaust mods, intake mods.  If I remember, milling the head/decking the block, and opening up ports yielded the biggest gains at usable rpms. 2000 to 3300.