I have the standard exhaust manifolds and K&Ns and have BAF needles. These were recommended by Beech Hill garage. Clive W recommends BBWs.
I find that mine is sensitive to petrol type.If set it up on regular it hangs back if I fill up with one of the Super grade fuels. I have to set the carbs for the fuel grade. This may be down to the ethanol content and the different stoichometric ratios for petrol and alcohol.
There was a BB series on needles and K&Ns in 2009, initiated by a rolling road test by Alan Rennie and followed up by Gordon Hesketh-Jones and others. Info was published in Victor's V8 section in April 2009 Safety Fast. This includes a very useful graph comparison of six needles, BBU, BAQ, BDL, BAF, BBA, BBW and BAC (in order of increasing richness). I have this on my PC but, sadly, it doesn't seem to have produced a V8 Note.