Unless there's a problem with your W58 I'd wait on the R154 swap and swap it in when you get the GTE. It's a much heavier transmission and generally not as smooth shifting. Spend the money on other components which you'll still be able to use with the GTE though... fuel mods, suspension, etc.
Krem, just because an engine is from Japan and has fewer miles doesn't mean it's not complete garbage. A lot of those engines were beat to hell and/or saw nothing but city miles... they're also still 20 years old. If you get a JDM you still should plan on having to rebuild it.
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