With the small end being bored out anyway, would the only problem be the length?

So the question is...

What is the difference in the length?

Thus should be able to work out the new C/R using c20 let pistons and if the outcome is unacceptable look at different piston options.

I think using silver top con rods, c20let pistons and a bore of 86mm the C/R is around 7.4/1

Would like this a tad higher but not much 7.6 to 8 would be nice for better throttle response.