Don't panic ... don't panic!
Sorry Don I was in the workshop - you must shout louder next time
In fact the person whos workshop I was in has a Mk3 with a 2.5 PI Saloon engine in it, too, so I might actually be able to help here!
His is actually running on Stromberg 150s to confuse the situation. He started with Delco Remy, and then changed to the appropriate Lucas (although
with vacumn retard rather than advance) and this has proved to be better.
It's not worth cutting corners on this sort of thing, i don't reckon, as if you do a decent mileage the improvement in economy that you get from
running things correctly more than pays for the cost in parts. Basically, i would recommend sticking the appropriate dissy to the engine not the
bodywork, especially as the Lucas has the reputation as being the better model.
As an aside I've got a Mk3 with a Mk2 engine and a Lucas distributor ... oh lordy i am a hypocrite!