Bugger off the rover turbo inlet, fit a HO inlet from a Mondeo or escort, use the whole thing and use side feed injectors, or graft on a different fuel rail and use top feeds.
Not had a read out of mine but pulls very well at 21psi.
Also the R&D needs to be on a 0.48 housing and have the course Cosworth 4wd compressor side to hit 300 bhp imo