To change the Extra Health change

addhook("ms100","ehealth_ms100")
function ehealth_ms100()
	for id = 1,32 do
		msh[id]=msh[id]+1
		if (player(id,"exists")) and msh[id]==1 then
			msh[id]=2
			ehealth[id]=700-- Change here 
		end
	end
end

The default health is 700.

If you want to use the Zombie lua script write
dofile("sys/lua/ehealth_zombies.lua")
in your server.lua

or if you want to use the lua script that gives everyone extra hp write
dofile("sys/lua/ehealth_everyone.lua")
in your server.lua

Make sure that you dont tell anyone that you've did this script