v8 hot starting problems

Hi

I have a lightweight fitted with a 3.5 v8 out of a 1984ish range rover

it starts well when cold, runs a bit rough but has plenty of power

If it is stopped when hot it will not restart

when it does this it seems to have a good spark, has good compression and is getting fuel to the carbs

I am pulling my hair out with this, has anybody any idea what might be wrong and what can be done to cure it

thanks in anticipation

Ian