I need a new head for my A14, old one is soft from overheating... will an A10 head bolt on and if so are the ports and valves and combustion chambers the same sizes?
If not, will it raise the compression too much if the combustion chamber is smaller?
can the ports be ported out if they are smaller? and can the valves be swaped in if they are bigger on the A14?

the cars a KB10, has a lumpy cam and 2" exhaust system. and the old head was shaved 1.5mm, im intending to prep it for historic racing in the unmodified and sub 2.0 class, so it needs the performance, not to just run.
cheers and thanks in advance for the help