Do the 200-4R with your planned 3.42 rear gear.
Best fit, easiest installation and can handle your 240 hp 400 no problem.
If you do later decide to swap in a substantially more powerful engine at the same time you can upgrade the 200-4R.
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1964 Tempest Coupe LS3/4L70E/3.42
1964 Le Mans Convertible 421 HO/TH350/3.08
2002 WS6 Convertible LS1/4L60E/3.23
1966 VW Type 2 Single Cab Pickup 140hp 2276
1956 VW Type 2 Panel Van 36hp 1200
1957 VW Type 1 Beetle 180hp 2276
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