It is important to remember that post 94 engines were heavily revised in all areas, block, crank, rods, pistons and heads mainly !!! The main difference between a 10 bolt head, HRC2479 and a 14 bolt head, ERC0216 (SD1) or HRC2210 (Land Rover) is that the cubic capacity of the heads was reduced from 36cc to 28cc. It is this fact that is key to my original posting on this website.
In the Land Rover Technical archive there is a thread titled: "3.5, 3.9 & 4.2 heads" which is quite exspansive . From that thread, the explanation is quite clear, that fitting post 94 heads to a pre94 engine results in a c/r increase from 9.35 to 10.55 on a 9.35 c/r engine. My question has been, what is the resulting c/r increase to a 8.13 c/r engine? I don't have the relevant technical data to do the calculation myself.
As far as obtaining 9.35:1 c/r engine goes, it is just too expensive and doing an engine change on a P6B is not a job for the faint hearted! The era of good condition RV8s available for peanuts is long gone and such engines when they do become available sell for in excess of £750 - £1,000. I am quite capable and confident of undertaking a cylinder head change though!