Can you stroke a 5.2 / 5.9 , and keep it EFI ????

ive seen comments on internet , some said that they did and some dont , but i never had nothing concrete , trying to get some advices here .. ive seen guys swapping their magnum heads for aluminium ones , and reground camshaft too ? , but how can this set up run good if its fuel injected and as is limits with the oem ECU/ pcm .

thx a lot ,