I wanted very much to keep her as stock as possible. However, reality dictates the swap. I simply haven't the resources or the time to rebuild the original 330. So, I have a nice running Chevy 350 to drop in. I am wondering, in advance of the swap, what headers, if any are available for it. Also, I don't think the stock motor mounts will work with the new engine. I won't know until I have the 330 out. Am I correct, or am I goofy?
I already have the proper adapter plate to keep my automatic transmission. Earlier, I had to replace the original two speed with a late 70's Pontiac TH350.

 

Typically frame mounts, motor mounts, & headers from a same year Chevelle/Malibu should be what you are looking for.

Since you have the trans adapter, the only other hurdle is relocating starter wiring to the passenger side.

 

As stated above, just treat the car like a same year Chevelle. Engine frame brackets and engine mounts, minor wiring changes, etc... will be required.