Either a wirespliced PGM-III or an 030 carded PGM-IV can make very good power.

If you've got a '28 the nice thing about the PGM-IV is that you get to keep the smartcard/digital dash/fancy steering lock etc.

The nice thing about the PGM-III is it doesn't cost a fortune.

But to fit the PGM-III to an mc28 and get the benefit you will need;

PGM-III
loom
ignition barrel (and key)
mc21 flywheel

you'll also need somewhere to mount the PGM-III and somewhere to fit the ignition barrel. Plus you'll either lose the steering lock (which you'll need to remove) or have to sort something else out to either use the mc21 mechanism or rig a wire to fire the mc28 steering lock release.
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