ACT plenums

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I read with interest the news artical about the new triple bodied plenums from ACT, as I am looking to get a bit more go out of my standard 4.3 grif I was wondering if anyone had thoughts re. starting with the induction side of the engine or sort the heads out first. Also had a look at RPI Engineering website and I am interested on comments regarding their larger Air flow meter as the standard Rover one does seem restrictive.
Plan to do something once funds/wife allow!!!!

Thoughts Anyone????

[ginger toss]

anyone care to comment wether heads should be done before the induction.
Tim, I would be looking at the twin bodied plenum then, do you think that the bigger air flow meter as well will help?

[ginger toss]

Any idea of the gains?