A stock rebuild on a TH350 should be plenty adequate if you’re not a racer.
Exactly what’s behind the 8.8:1 421 HO in my loaded Le Mans convertible.
Spending more to upgrade it is fine if you think you might be hard on it, however it does add up quickly to do anything substantial in the strength department. They’re a good transmission and my builder said upgrades weren’t necessary for my application.
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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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