throttle body size is'nt as critical as carb size. in most instances 45 bodies are plenty and if a bit on the big side dont really suffer a downside anyway, a pair of 45's on a 4 cylinder will have enough flow potential for 260bhp so 3 will be more than up to supplying your jag.
with injectors you can get technical and work out how much much power you are likely to have and find injectors big enough to supply that much bearing in mind you dont want the injectors running at 100 duty cycle,
or what most do and just find a set of a std engine which is in the power ball park that your looking for, that said almost all production engines have loads of reserve capacity in their injectors typically 30-50%
injectors dont really wear so loads of engines are out there running on injectors sourced from scrap yards.
yellow bosch ones as fitted to cossies will supply enough fuel for around 280bhp
Xe 16v vauxhall ones are good for about 240bhp
so using 6 of either the about will be more than adiquate for your jag,
or a set of from an old 6 cylinder bmw 535/735 ( i had 200bhp using 4 of these)
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