Since you are building this bad boy ground up. . .I would recommend a different engine now that I think about it.
You could step over and grab a GDI and lean burn your way to massive MPG. I dunno what the laws are for WA but for alot of places custom builds don't have to meet EPA which means the GDI's standard no cat emissions are much lower than GII.
As you stated about the CVT though it (GDI) also requires some tech to go along.
Although the convenience of already having the engine is hard to overcome.
The new Lincoln MKSs and Cadillac STS(might have wrong model I don't keep tabs on caddy) have them as standard if you wanted to get one from a dealer.
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