Are regular valve seals and umbrella seals interchangeable?

[leftybass209]

The 350 in my truck is leaking oil into the cylinders through the valve seals I'm assuming (rather hoping it's not the rings!). I hear that umbrella seals are better than the original valve seals but to be honest I'm really inexperienced when it comes to cylinder heads. I'd like to know what would be the best option to seal the valves from the top. I read about the compressed air to keep the valves up during the seal change, so I think that would be a fairly easy thing to do. Also, If i have to take it to a mechanic to have it done, would it be cheaper to have him replace the seals, or rather, purchase some new heads? Any info would be greatly appreciated, thanks!