[Lofty]

It's about time for a service , so got some new spark plugs (still waiting for distributor cap and rotor arm) and as a special treat purchased a Beru spark plug lead pack (including coil lead ) from 034 Motorsport as old leads are now 31 years old.
Thought I would change the plugs and leads today and do the dizzy cap and rotor arm when they turn up.
So done the change and now the car runs like a sack of sh#t.
Wouldn't idle and won't accelerate properly. It feels like it's being choked , bubbling away but unable to break free (if that makes sense) ?
Was running ok before the change so I thought it might be faulty leads so put old ones back on ,still the problem , so changed the spark plugs back as well and it's still running crap.
There is a whiff of petrol and it's smoking out the exhaust.
Ideas please ?