The 20ft v bottom was before the flat. The first flat was the wood deck yellow and blue one he won the Orange Bowl 250 in 1969 with the injected Boss 429. I posted a pic of it earlier in this thread.
Interestlngly, the very first V bottom GN hull win was the 1967 Outboard World Championship in Havasu with 3 Mercs driven by Rudy, Ron Larson and Michael Reagan.
But I believe you are correct that the first inboard powered 20 ft GN was Vic's "Big Red E" at the Elsinore 500
Rudy swore the 20ft V bottom is nothing more than the Allison hull cut down and straked. When built the flat for the Orange Bowl in 69, he just threw a "false" bottom into the mold to flatten it out. Who is I to doubt it. Sounds possible.
Vic in the Big Red E and Butch Patterson in Rudy's Phfft
Vic at the 68 Elsinore 500. Kam Nelson was the trophy girl.

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