For anyone still looking at this page for info, I have just done a conversion to my mightyboy, I fitted the G10A and it could not be easier, I noticed that Paul shortened his drive shafts...This is not necessary, as if the engine is put in the correct spot, belt pulley 15mm off the drivers side rail...

I have a couple of good second hand auto's if your still looking for one...let me know, cheers