A small note about the port and polishing. This is fine as long as it is only done on the exhaust side of the head. I will state reasons for this below. As well as some additional tips....
1. Make sure to port match on the head where the exhaust maniford mates up. Reason is, port the exit of the head too big, gasket will be in direct flow of hot gasses, over time this will cause failure of the gasket in those locations. Failure will result in material pushed into turbo causing damage you dont want. Only open the exhaust port to match the gasket being used.
2. Make sure the exhaust manifold itself will be able to utilize the extra flow created by porting, otherwise its like trying to blow through a straw when it should be blowing through a 3/8 hose(used for example). You wont reap much, if any rewards for the work you have done.
3. if you are going to port the head you might as well install larger valves making sure the machine shop does a 3 angle grind. Reason for this. More air/ fuel = more horsepower, and since the head is already off might a well build the upper end as well. Dont forget make sure the valves are stainless and valve spring pressures are adequate for the job. Might think about installing new cams at this point as well.
4. Never port and polish the intake runners. You can port but never polish. Reason for this is, if you ever look in any intake manifold they either have grooves or bumps on the inside of them. This is their for two reasons. 1. to help in proper fuel atomization. 2. to keep the fuel from collecting on the walls and coating them. This goes the same for the intake side of a head. Port match as you would for the exhaust side, port to allow more air, but leave it rough, no polishing, otherwise you may not always run into problems and a rough running engine due to improper fuel atomization.
5. These are what you would call guidelines to ensure that all ends well, take them for what it is, do what you wish.
I have been building high horse power muscle car engine for years. I have seen what can happen when these rules have not been followed by others on muscle cars. I would think the same would apply to honda motors as well, but I could be wrong.