BlueDanGroup, in terms of engine performance looks to be about £2100, plus £1350 for the head work, from the receipts.
craigb244, there's no replacement for displacement period, with the same state of tune a larger cc engine will develop more torque/power, even when you go in to forced induction the same rules apply. You can go someway to compensate for a lack of capacity by turning up the boost level, however this turns the engine slowly into a rev happy engine with loads of lag.
There are effectively 2 types of engine tuning. One type, the easiest & cheapest to do, mainly shifts the available torque to one part of the rev-range with very little net gain over the rev entire range, typical examples of this are sports exhausts, cams & intake manifold tuning.
The other may or may not shape the torque curve but increases the total area under the torque curve. Forced & nitrous oxide induction are the the big 2 in this game but a sorted induction kit, careful working of the head & an increase in CR* in N/A applications can do this effectively if you pay attention to everything.
* an effect of increasing the CR is that it has a bigger effect at higher rpm than lower so is seen as a 'bad' for low-end torque. It's not that it's bad, it's just better at raising high rpm torque. Think of the gain as extra expansion pressure per bang, there are more bangs per second at 5000 than 2000 so you get proportionally more gain.
EDIT: the reply to craigb244 is a really bad way of putting it but I hope people get the idea
craigb244, there's no replacement for displacement period, with the same state of tune a larger cc engine will develop more torque/power, even when you go in to forced induction the same rules apply. You can go someway to compensate for a lack of capacity by turning up the boost level, however this turns the engine slowly into a rev happy engine with loads of lag.
There are effectively 2 types of engine tuning. One type, the easiest & cheapest to do, mainly shifts the available torque to one part of the rev-range with very little net gain over the rev entire range, typical examples of this are sports exhausts, cams & intake manifold tuning.
The other may or may not shape the torque curve but increases the total area under the torque curve. Forced & nitrous oxide induction are the the big 2 in this game but a sorted induction kit, careful working of the head & an increase in CR* in N/A applications can do this effectively if you pay attention to everything.
* an effect of increasing the CR is that it has a bigger effect at higher rpm than lower so is seen as a 'bad' for low-end torque. It's not that it's bad, it's just better at raising high rpm torque. Think of the gain as extra expansion pressure per bang, there are more bangs per second at 5000 than 2000 so you get proportionally more gain.
EDIT: the reply to craigb244 is a really bad way of putting it but I hope people get the idea
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) that saying had more meaning in "ye oldie days" where clearances where done by eye 
