Have a chat with Northampton Motorsport - the guys there are working on a lot of different engines/applications including a bunch of hill climb and sprint cars. the main guy there (forget his name) has a very good understanding of what's available and what is achievable and is a wizard on the tuning side too - they have in house rolling road facilities. He can also advise on a few things that are possible which you may not have considered such as launch control, traction control, etc., etc.
While carbs are good for WOT applications, I think you will get much more flexibility and control with a multi-throttle EFI set-up
I have no affiliation with NMS, I follow them on instagram, and intend using them for corner weighting/geo when my car is done - they're local to me, and from the chats I've had with them and the work I've seen, I'm more than happy to recommend them
As a disclaimer - the below isn't an advert, I am not offering services or anything, just passing on an opinion HOWEVER I am happy to help out if required/where I can with bits of machining, etc for donations to the DDK Macmillan fund.. I have also been known to work for pizza!
Personally, I'd avoid spending the money on the Jenvey set-up and DIY the throttle bodies and the installation (fuel rails, injectors, manifolds, throttle cables, etc) myself. Bear in mind, they're only supplying the throttles and the manifold, which is only about 1/3 of the battle - the "hard" bit is the linkages, although there's no reason that should be too troublesome either. I have nothing against Jenvey, and their stuff is good quality, but its easy to get the same parts and results for 1/4 the price if you're willing to do the graft
Provided the bodies and the injectors are sized suitably, and the injectors are compatible with whatever ECU you decide upon then you won't have any issues - it will also free up more of the budget to spend on the ECU / tuning side of things which will bring more of the benefits than an off-the-shelf bolt-up set of manifolds and throttle bodies
If you want to have a chat through what might be possible let me know - I've done several ITB conversions on different cars (including a 911 and a Karmann Ghia) using a couple of different control systems. If you have any question marks over throttle response on an engine with EFI and one throttle per cylinder I can fix you with one short drive
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