After some of my own dabbling and also probing around on here for others' opinions I will probably run:
Bosch 044 in tank pump
Stock fuel feed line
Stock fuel filter
-6 line from filter, split to feed either end of rail
Modified dual feed rail
650cc High Imp SARD injectors
Stock FPR
Stock return line
I did have some concerns with a Walbro pushing 600bhp through stock lines (not a -8 aftermarket feed and a big free flowing rail with top fed injectors) but am assured this is no issue for a 044 so I have pretty much chosen that pump (and that's all I have left to get hold of as well). My Walbro will come out and be donated to the BPU vvti