The V6 cologned pistons fit the std rods, whcih are more than adequate for the power you are running, if a little heavy.
When you've bought the pistons just take them to whoever is doing the machining and say bore to suit these please, there's stack loads of metal to get this bore size, try for prices from the machine shops as they can be very good, last set of 4 cologne pistons I bought were £24 for 4.
You could put 45's on it, but it would then need jetting to suit, a carb wonderful though they can be, doesn't stand a chance of matching a injection set up for driveability/performance/mpg, decide early on what you want to run, if going 45's it needs really to get the best a mappable igntion system, failing that you need to spend a day doinjg dizzy runs on the road to get your advance curve as best you can, it's easy but time consuming, but it is FREE!!
Basically with 45's fitted, you're going to need a shit load more initial advance but a lower total amount high up, this can be acheived by bending the stops inside a dizzy that has advance retard weights, these can easily and cheaply be converted to fully electronic even with the weights, if you don't do this would be a complete waste of time modding with extra fuelling.
tabetha