Ben,
Most knowledgable small block builders seem the think that the sb 427 does not have a good rod ratio. Most of the big cube"racing" small blocks are around 408-410 cubes. You can build an engine of this size and still tell everybody it's a 427 if that number is important to you.As far as performance, any of the big cube small blocks will usually beat up on the FE's.
If you are building just for show and cruising why not build an FE.
RD