BEST 1/25 '70 Cuda Conversion?

I want to convert the JoHan S&M '71 Cuda Pro Stock to a '70 (might want to convert one of the AMT '74 promos and/or the MPC "Pro Street" kit, too, maybe). I believe Reliable Resin offers a '70 conversion set, and I see Modelhaus has '70 parts (such as grille) reproed from the original MPC annual. Any other options? Which of these is BEST?

Note I'm only asking about 1/25, NOT 1/24 for the Monogram/Revell '71 kit.

Source: http://cs.scaleautomag.com/SCACS/forums/thread/1020470.aspx

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