Bosh 044 pump will do the job. also i wouldn't bother with a 5th injector fuel delivery can be somewhat uneven lol
90% of the people on this forum will tell you to go efi. its the way forward. If efi is not to your taste i would have all of your fuel system refurbed and rebuild and you may see some good power from the mfi. 200 is more than achievable with just a few mods and a good set up. 250 is abit harder tho lol

good luck buddy.