to be fair i think the op is obviously quite young, thinking back to my youth i wouldnt of been spending money on converting to efi i couldnt of afforded it, i wouldnt say your a mile out at 88 bhp anyways what were the mk3 xr3s ?
no doubt some dizzys are interchangeable last year i put a fiesta 1100 dizzy on the 1600 crossflow in the dutton and it works a treat
as tab says alter ignition timing and see how it alters, i had a 1600 crossflow years ago in a mk2 escort and it had naf all advance so i just set it so it pulled up top perfectly, only problem was it wouldnt idle below 2500 rpm the joys of youth