We would recommend you use modeling clay to see if you have any contact.
We don't know what your head or block tolerances are, either may have been decked in the past.
As for the pistons, we recommend the 83mm and have your block bored. This would allow for the proper wall clearance for expansion and also proper oil control.
The UK is covered by Paypal sellers protection, so we can accept any major credit card via Paypal.
Before you purchase please ask for a freight quote.
Due to a recent change with Royal Mail and the USPS, all international orders over $100 will be shipped Express Mail. This is done because they allow for higher insurance rates to cover loss.