Kris I have a kit here... LOL
BTW; I reckon your problem, since it happened after the motor swap, is the connection to the pump from the LP reservoir side. I bet the banjo bolt they use is not in properly- if it is positioned such that flow is restricted, it will groan. One has to crush the aluminium washeres a little, but not too much. Shogun did a post somewhere on what happens then the bnanjo bolt is over torqued (it deforms inside the pump) and also restricts flow. Make sure that is not the case by removing it (your reservoir will drain in the process) and then reinstall carefully. There must be a knack, see if yo can find it. Same problem on my nieghbours e30 after he replaced the LP hose... research the installation/test procedure perhaps in the TIS? BTW; Like Bill, I've used Castrol Transmax Z in ATF and CHF 7.1 systems with fine results. Come by on the weekend maybe and colect your bits? I'll find one of those ps kits somewhere... a mate of mine wil be coming by from Melbourne- he's a serious (e28/m30) Bimmernut so u should meet him... Good luck in the meanwhile!

Nick