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I'm transplanting a great running Metric Mechanic Hiflow Sport ST 3500 into my '81. Someone told me recently that I should dump the Jetronic and do a full Motronic conversion now. This seems daunting. Is it doable? Worth it?
Advice will be well received.
Thanks in advance.

The current school of thought seems to be to go to Motronic 1.1/1.3 off an E34 era car if you're going that route. The advantages are a better idle, better economy, cleaner emissions and the ability to do it anytime, no special flywheel is required. The disadvantage is a (slightly) custom wiring harness is required.

The advantage of Motronic 1.0a off an E28 535 over L jet is better idle control, better economy and cleaner emissions. A stock E28 motronic harness will work. Disadvantage is the need for a motronic flywheel.

If it was my car I'd just do the engine now, see if I liked it and was satisfied and go from there without any engine management upgrade now.

Thanks Mike. Just the info I needed. I'm leaning towards your suggestion to stay put for a while after I swap the motor. I've got a long list of changes/upgrades so if it's easiest enough to do later I'll keep it as a down the road consideration.

Almost forgot, that engine may have a motronic cam and need the adapter/repair nut to use a conventional distributor, no big deal, about $35 the last I knew.