Help Please

Hi there
my son and I have a mk2 Escort RS 2000 with a Cosworth YB 2wd standard spec engine.
It has been laid up about 4 years and several months ago we made a start on resurrecting it.
We have fitted a new roof to replace the old sunroof one which someone tried to weld and fill.
However,apart from this ,we have had nothing but zero results in getting it to run right,as it once did.
IT starts, but really badly over fuels and takes absolutely ages to get to run on 4 cylinders cleanly,the plugs are black sooted as you would expect.Plus it won't tick over at all,it just cuts out.😁😖😡
We have replaced;
Plugs
Distibutor Cap
Rotor arm.
Crankshaft sensor
Phase sensor
Water coolant temp sensor
Air charge sensor
MAP sensor
We are currently debating changing the Idle Speed Control Valve which we have cleaned adjusted and think it should be OK.
Does anyone have any ideas ???
Thanking you in anticipation.