totally different engine from the mazda genre dohc series
the CVH is a very historical engine, and has proven itself across the pond over in england.. the 1.6L CVHs, found in the escort rs turbo's, utilize a true hemispherical combustion chamber setup and have seen well over 300hp on their 1.6l mfi setups. here is a thread i started on one of their boards
http://www.passionford.com/forum/viewtopic.php?t=110898
Now, stateside, Ford used the mazda bg chassis and designed the ford escort shell around it, known as the 91-02 escort (91-96 2nd gen and 97-02 escort 3rd gen sedan, 98-current zx2)
Utilising the bg chassis they designed factory mounts for the ford cvh engine to be compatible with the mazda bg chassis
That said, ford detuned the cvh here stateside (91-96) and made the 1.9L SEFI, bored out accordingly and encompassed it with a longer stroke setup, with learnburn combustion chambers shaped more as a heart in a way. They detuned the cvh for economical purposes and utilised it's torquey nature for a great gas milaged car, where it can be seen to have over 40mpg.
In 97 they released an upgraded cvh engine, the 2.0l spi, with larger intake and exhaust valves, possibly more stroke than the 1.9 (that i'm leaning towards, but not that much) and a split runner setup in the intake for each cylinder, one for torque powerband (low rpm) and one for hp powerband (high rpm). They still utilised a lean burn combustion chamber, tho.
With all this said, we have made over 300hp on the 1.9l block mated with the 2.0l spi head, a hybrid.
http://www.cardomain.com/id/jeffescortlx He's the guy that put the myth to an end back last fall, and has seen great numbers on an otherwise stock setup, from the 1 7/8" exhaust to the stock ignition timing and fuel maps. 212whp 263ftlbs of torque at only 16psi at 7.6-7.8:1 compression ratio NA mode.
By him doing this, it has shown us a lot about what we have. We are looking into (or as I will down the road

) into completing the combustion chamber to a true hemispherical design and possibly matching the setup with pistons to account for the added volume and utilise the full transfer of power so to speak per cyl.
Once we do this, and the stroked nature of this engine, we will undoubtedly (with tuning and fi) see well into 400ftlbs with upgraded rods and the like.
So for swappability to be there, it's a no brainer; if you have a bg chassis design it will work, with all needed goods transferred.
Basically our community involves bpt swaps and most importantly development of our economy-applied cvh's into mean powermakers, and it is happening. It's a great source of info on both the mazda and ford end of engines.
Btw the zetec was designed from the cvh, as well as ford taking info obtained from the bp and applying it to a dohc setup.
Anything that may seem unclear as I have outlined above please give me an email or PM or reply here and I will gladly go into it in more depth.