You can just get the injector bosses, which allows top feeds to fit. He can use the same injectors without issue, like these (another option):
https://rocketindustries.com.au/af59-2210-rb25-fuel-injector-inserts
The Racework ones look a bit better:
https://www.nzefi.com/product/raceworks-lower-injector-mounting-boss-kit-for-r33-rb25det-s14-s15-sr20det/
You could also just get a similar kit like the Radium one by Plazmaman:
https://plazmaman.com/product/nissan-rb25det-r33-billet-fuel-rail/?srsltid=AfmBOoogfYq49X0fu2Wdbf8yOf6zt9egyPAif_gn3Qr3G8hzAphhTgOkO70
There is a LOT of stuff that can be done, it all depends on how much time and money you want to spend on doing in. Not all ECUs will be able to do it, and the more control you need the more time and knowledge needs to be put into making it work.
If you're willing to spend the time and money and have the right hardware and skills involved there's a lot that can be done.
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