[BLSTIC]

Or the Ford Kent motor. I mean it was developed in '59 for the Anglia and kept on keeping on until 2002.

I once had ideas about updating the Holden 202 Black EFI. It was an engine designed in the 40's and kept getting updated until the 80's, where Holden engineers tried to make a silk purse out of a sow's ear by fitting EFI. It made 101kw from a 3.3 litre OHV non-crossflow emissions engine in 1984. Except it did it with mechanical/vacuum distributor, single hole injectors (that didn't even have a real spray pattern, they were more or less jets), simultaneous injection, and a non-mapped computer (it was based on an airflow meter signal with corrections for air temp, water temp, full throttle and zero throttle. It was kinda correct most of the time. Basically like a carby without atomisation and fuel distribution problems).

But I have a better sewing machine than 80's GM, I envisaged dynamically matched late model fuel injectors (12-hole items off, say, a Yaris), a modern sequential efi computer, proper TPS, larger plenum, 5-angle valve job, and some minor porting (more about equal airflow than anything else). I reckon it could gain 20kw from that and probably drop fuel consumption by 25% in cruise and closer to 30% around town, should appropriate tuning be done.

But you're starting from a 90's machine, I'm not sure gains of that magnitude are available from something that already has sequential EFI (I assume).

Does your car already have sequential EFI? How good are its injectors? Subaru once had air atomising injectors for cold starts that may help your cause.