Hi Gareth,
My understanding is that if you are going to stay with the stock size pistons then you should stick with the B18 head due to the combustion chambers sizes, do the mods like classicswede suggets and port and polish the head with a cam to match and this will give you a nice increase in performance. If you want to go for extra performance bore the cylinders to a B20 then a nicely ported and polished B20E head will give you good gains with minimal mods to the head. If you want to go to town with head work then go for a B20F or the late B20 carb head.
Apparently the casting quality wasn't that great for the B18 and you can get voids which may hole when boring the cyclinders.
One thing for sure is if you are paying someone to do your head work then you need to decide up front what way you want to go as it isn't cheap.
The difficult thing is deciding how much power you will be happy with before you start, how far from stock you want to go and how much you want to spend.
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