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I have given this some thought and have a few dreams floating around, now depending how adventurous your dreams are then I offer some bizarre ideas. The first thoughts are to cut the rear two cylinders off a KV6 and the front two cylinders off another KV6 and weld the two "V4's" together to create a V8. The obvious to me crankshaft is the 82mm stroke Rover V8, these are relatively short so the crank journals might just work, some enterprising souls in the USA are machining Ford cranks to fit into into Rover V8's!  A likely source of cylinder heads are the Ford SHO V8 engine, these were a 3.4 litre V8  and have a very adaptable inlet manifold. The bore is very similar to the KV6 so they might just work  If they didn't have a cast iron block they might have been an interesting engine to go into a TF, being a 60 degree they are about two inches narrower than the KV6. Like you have done the side air intakes need a fan each side and scoops as well, if MG Rover had survived the next iteration of the TF was going to get scoops, aerodynamic testing showed that the existing design was next to useless and the MGF was even worse. The standard radiator would easily cope, the aerodynamic testing actuall shoed that air comes out of the upper vents at speed on a TF, the problem is that the air has nowhere to easily escape after passing through the radiator. Adding a vented bonnet not only allowed the hot air to escape but also reduced front end lift to zero. https://www.aronline.co.uk/concepts-and-prototypes/concepts-mg-tf200-hpd/
The current Jaguar V6 follows an interesting philosophy in that is a V8 casting without the two rear cylinders, it should be relatively easy to convert a Jaguar V8 into V6 6.png
Another interesting twin engine-ed car; http://www.dlg.speedfreaks.org/archive/cars/fittipaldi/3200/3200.php
All these idea are just from taking two Paracetamol and two Ibuprofen, imagine what I could come up with after taking something that hallucinates. 
 

So I'm not the only mad scientist around here.....it's good to have the company of like minded souls!

Thanks for those ideas, I'm going to digest that lot, it will give something to do at work tonight.

The Buick/Holden iron 3.8 V6 was developed from the old iron Buick V8 which cams in various capacities from @ 5.0 to 5.6 litre itself a derivative of the Buick/Oldsmobile 3.5 alloy V8 which was of course the origin of the Rover V8 and the Repco Brabham 3.0 V8 that won the F1 world championship in 1966 and 1967, there were other versions of the repco engine used in the Tasman Series 2.5 litre, and sportscar and CanAm racing 4.2 litre.
The Rover V8 was also the basis of the Leyland P76 4.4 litre V8 which had a higher deck height  for more stroke and Repco also developed a 5.0 litre version using the P76 block for F5000.
As an aside Repco were doing 2 different F5000 engine at the same time as they also did the very successful  Repco-Holden F5000 engine developed from the iron Holden V8.

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