A chap does make ECUs for the EDC pumps. I don't like referring people to other places but honestly everything you want want to know is on the superturbodiesel.com forum, including the ECU guy.

You can get larger elements installed in pumps if you want big power but it has to be done by a specialist shop. Most will recommend a Swedish company called Dieselmeken. There are some others around though as well.

Honestly your best option is just to pick up a lower mileage engine...it 'should' not need any work for a long time. It's a fair investment in parts and money to rebuild one....just start off with a good engine

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1978 300D, 373,000km 617.912, 711.113 5 speed, 7.5mm superpump, HX30W turbo...many, many years in the making....
1977 280> 300D - 500,000km+ (to be sold...)
1984 240TD>300TD 121,000 miles, *gone*
1977 250 parts car
1988 Toyota Corona 2.0D *gone*
1975 FJ45>HJ45
1981 200>240D (to be sold...)
1999 Hyundai Lantra 1.6 *gone*
1980s Lansing Bagnall FOER 5.2 Forklift (the Mk2 engine hoist)
2001 Holden Rodeo 4JB1T 2WD