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I also own a 740 GLE wagon with the B234F, but with an autoatic tranny. The 16 valve head is the affore mentioned 'hot rod' factory option....however, the hot build with this head is to bolt it on to a B230 red turbo block - and it's not all that simple as just bolting it on... and it's not a cheap build either.
As it's been already said, outside of replacing your current set up with a different motor (SBC 350?!) there a few performance gains to be had by piecemeal upgrades.
I have not seen any info on swapping out the fuel injectors for higher flow versions, that night be another place to look, but I don't see anything that's going to get you a substantial increase in HP without goijg to a different powerplant.
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