164 24 valve engine.

There would be power gains to be made by adding the Itb's to the 12v but the gains are hard to justify relative to the costs involved.
To add ITB's to the 12v you would need to buy an aftermarket ECU (probably Emerald), a new engine loom, AH motorsport inlet runners, Jenvey throttle bodies & a rolling road session.

Fitting the ITB's to a 24v would be productive from a performance point of view, you will still need all of the above & in addition to fit the 24v to your car you will need to modify/re engineer the following-

Engine mounts
Exhaust system
Coolant return pipe

The fuel system would need re jigging for Itb's but nothing major.
The gear linkage could be left as it if you retain the 5 speed, if you were to go 6 speed then a swap to cable would be the easiest solution.
A Quaife lsd is a benefit if you intend to do track days but I doubt most will notice the difference on the road.

The gains of fitting itb,s to a 12v would take you to stock 24v power. If modding the chassis is out, then go itbs on the 12 and a change of cams.

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Originally Posted by strat24v

The gains of fitting itb,s to a 12v would take you to stock 24v power. If modding the chassis is out, then go itbs on the 12 and a change of cams.

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I have a 12v QV already. Are those cams any good?

Too mild.

I read recently that ah motorsports found bigger hp gains fitting just itb's on a 12v than they did on a 24v. You'd need some decent tubular manifolds too, 24v ones can be modified to suit.

I haven't got any figures for a 12v engine, the only one I know of is the one that Susit has now built by David Carson.
I know of a 164 24v with ITB's which would have been 210Bhp stock but with Jenveys & an aftermarket ECU makes 276Bhp which seems like a reasonable gain.
I guess that will be a 50:50 split between the ECU & the ITB's, junking the AFM & going to the aftermarket ECU will have taken it to approx 240Bhp the rest will have come from fitting the Itb's.