tetsusaru47
Go for the 77/77.5mm bore for an upgrade
it wont need sonic testing.

Otherwise peugeot liners from any 1.9 litre
sohc 8v head will most likely fit (to be confirmed)
once the block is machined for a wet sleeve setup.
This will make 83mm ca18de pistons a straight fit
as they have 29.9mm compression height.
Im hopefully going 83.5mm to leave room for further
rebuilds in the liners but most Pug/frog/french car
lovers have confirmed 84mm is safe but leaves no
room for further honing.

if you laws are strict the 1.8l options is good and
if the laws of your land are easy then 77mm with boost
and a single su will be awesome.