You need to disconnect the mechanical fuel pump !( it's no good for this job!)
And you need to get a high pressure fuel pump off of an EFI car!

You also need a rising rate fuel regulator!
( I wouldnt know how you go about getting this where you are! Maybe try performance shops!) ( This regulator never came on any car from the factory!)

Go the Datto did say the pulsar that you described and there is also a hatchback pulsar that came with the same engine!