Not very familiar with the Barra family of engines, beyond a quick wikipedia search, but is yours the I6, I6T, or V8 variant?...Any of which should be great fun, albeit certainly a bit on the large side as you've already noted, but I've always been especially interested in the idea of I6 Locosts.
To your question on frames, there are numerous 'common-ish' plan based enlargements of the standard 'book' frame: 1) McSorley +4 = 4 inches wider throughout.
2) McSorley +442 = 4 inches wider in the cockpit and rear suspension but standard width at the front suspension and nose cone, 4 inches longer (2 in the cockpit and 2 in the engine bay), and 2 inches taller.
3) McSorley +442E = 4 inches wider throughout, 4 inches longer in the engine bay, and 2 inches taller.
4) Haynes Roadster = 2 inches wider, 2 inches longer, and 1 inch taller. (Newer and from the Chris Gibbs book, which replaced the original book by Ron Champion)
Take a tape measure to yours, as it's distinctly possible yours already is one of these. Beyond that, I would say that the plans are really more of a general guideline. Many, if not most, builds get modified to better suit the individual builder and/or selected components. So it'll be interesting to see more about what you've got to work with.
_________________ -Justin
"Orville Wright did not have a pilots license." - Gordon MacKenzie
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