Testarossa 84 to 96

Not that I recommend it but, Yes, it's possible.
You'll have to fab up new intake manifolds for starters.

 

Four 3-barrel carbs might be somewhat less of a project (that still gives 1 barrel/cylinder) -- but still a ginormous project in $ and effort. Can you put a $ figure on your definition of "possible"

 

It's not a simple bolt-on of mostly existing F parts so doubt anyone (without cubic $s available) would ever do it (although it would sound glorious ). Here's a shot of a TR (in the lower RH corner) where individual EFI throttle bodies have been used -- so you get the great 1 barrel/cylinder intake sound, but, without the resonant intake system, same change to the HP vs RPM curve as indicated below:
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Might pick-up some very top-end maximum HP (but the stroke is a little longish on a TR to exploit this strategy), but the low/mid range torque would suffer -- better to just buy a 365BB (or 512BB) if that's the sort of beast you seek IMO...

 

The fastest and most cost effective way to get more horse power is to turbo charge. (twins).
You retain the CIS injection and re-tune.
It will be more cost effective to do this than to convert to carbs AND the car will retain it's drivability across the full RPM range.
Norwood Performance has kits for this.

You will have to budget a new differential carrier upgrade either way you go because the increased horsepower will blow it's guts out.....................just sayin'.

 

No, I wouldn't be too hopeful about this. Low restriction, high performance exhausts tend to make this same sort of trade-off -- high RPM power can increase, but at the expense of low-end torque (as the lower restriction raises the beneficial exhaust scavenging resonance to a higher RPM). If you look at the early F engine configuration -- super short intake path, good headers, alternate bank firing (giving the same resonance to all cylinders), and a very short stroke (so you can get to high RPM without blowing up ) -- HP vs RPM charts, it's basically a straight line where HP increases with RPM up to redline; whereas, a typical US V8 muscle car engine -- with some intake plenum volume, cast iron manifolds, non-alternate bank firing (so resonance occurs at different RPM for different cylinders), and a longer stroke -- has a much more "humped" shape where HP/torque in the low-mid RPM areas gets boosted up (by resonance effects) but the max redline RPM HP suffers a little (and you can't get there anyway because of the longer stroke). For street driving, even F went for a little more of the "humped" shape in the evolution from 365BB to 512BB (longer stroke) to 512BBi (longer stroke + added intake volume).

Without an airbox, it must sound simply outrageous (but not really a configuration that you can run in normal, long-time street use without penalty).

 

With today's technology and engine management available, carburetors would NOT be an "upgrade".

If you have the money to burn and still want the intake noise then electronic port injection with 12 individual throttle bodies would be the way to go.

 

True.

Mario