You want high-output circa 200bhp.
I can show you an ABF delivering +170bhp on OEM management with a good exhaust manifold and a few tweaks, but I can't show you a 100bhp/l output motor on Digifant 3.2.
For that you'll need ITBs and some pokey management, as well as cams and head-work.
I don't have that experience, as I don't have that sort of cash to play with right now and 170bhp in 1000kg is plenty for me to be going on with at the moment, so I'm not going to advise how you get to a plucked-from-the-air target figure.
HTHs.