A 30 over block likely can go 40 over or if need be 60.
You’re looking at a custom piston when it comes to the old 389s and 421s these days, as long as there are rings available you can bore it to pretty much any size.
If it was already at 60 over that changes things, but 30 isn’t bad.
They’re not growing on trees, you’re fortunate to find one at all I’m thinking.
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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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