The 2 litre head bolts straight on and will give the high CR for LPG.
The pics I've posted up were of my conversion which used the galaxy head, the castings are much the same and both suffer a bit from bad machining directly behind the valves and a bit of porting helps. The reason I used the Galaxy head was to keep a sensible (for petrol) CR without the need to skim the pistons, engine in the pics recently made 216bhp on power engineerings rollers using GSXR750 throttle bodies, kent RS2001 cams and Emerald managment.

Mark