Hi
I have a 3.9 eb on gas and I have a couple of questions
What is the best head to use on a 3.9 is there any advantage in using a later head
Will an eb, ie steel, sump fit an au motor
Are eb xr6 brakes different, can I upgrade brakes to xr6
Can I fit au2 brakes

You didn't mention if it was CFI or MPFI.
XR6 brakes are the same.
AUII brakes won't fit on those EA to EL stub axles.
The AU engine was designed to have the alloy sump, as the sump is also bolted to the main caps, so fitting a tin sump is defeating the purpose of having an AU donk.

Thanks for the reply
It is a multipoint injection
Can I fit au stub axles, frount end , to get the bigger brakes
Neat trick with the alloy sump, I have never seen that done before

No, you can't fit the AU stub axles to the EB.....the b/joints are in the arms,...... EA to EL, the b/joints are on the stub axles.
You can fit a 91DA inlet manifold in stead of the 87DA you have now.....the inside of the runners are slightly bigger.
The LPG gas mixer ( sits near the throttle body ) has a small hole....about 2" or so in diameter...versuses the throttle body diameter.......the mixer doesn't let enough air through.
My belief with LPG is that it's straight LPG, and built & tuned for it, or it's straight petrol....no mixing the 2.........two different fuels with 2 different requirements.