I personally prefer the car on big bores (although you will need to change the pistons for the UK surfaces ... have a look at the thread to see what I recommend). The barest minimum is to drill the rear pistons to 5x1.4 and run with something like 25wt AE oil in the rear and 40wt AE oil front on stock 5x1.3 pistons.
I picked up a load of time changing from small bores to big bores as the car was just far more consistent. If you speak to Kev Lee he will say the opposite though. That said there are loads of differences between my setup and Kev's (I use 7deg castor block, he uses 10deg for just a start!!)
To my mind the big bores are better for the average driver as they make the car react a little slower and thus a little easier to catch. I would agree that the small bores might be worth a fraction in terms of ultimate pace but until your going round for 5mins without an error then that is not important.
That said get to a track as rough as the moon and a properly setup big bore car will be able to carry much more pace than a small bore equipped car!
As for swapping between small bore and big bore on the same car I'd say DON'T DO IT!!! The reason for that is that you will want different roll centers and almost all the other settings adjusted too between them. This is down to the different levels of roll control generated by the big bore Vs small bore shocks so you have to manage that with geometry.
A lot of the fastest guys haven't had the opportunity to do the necessary setup work to adapt the car to big bores ... it is extensive ... so go with what they know as they can not afford to not be performing as people are watching.
Pays you money makes your choice but personally I am converted to the big bores (after 50+ hours tinkering time it must be said!)
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