Remember, start saying the justification mantra now:
"The only proper way to rebuild an engine is new pistons and cylinders"
"The only proper way to rebuild an engine is new pistons and cylinders"
"The only proper way to rebuild an engine is new pistons and cylinders"
I hope Superman doesn't see this

- I am shaping and moulding reason here!!!
Seriously, I am not really the best person to talk to about this - I more or less bought the engine "as is" and have used the opportunity to upgrade the p&c when the engine seller/builder (and I) were both not particularly happy with how the second-hand 95mm p&c sounded. I got a credit on those p&c and paid no labour to upgrade so it was an easy (although still very expensive) decision for me. I also had the added attraction of increasing compression (from 9.5:1 from the 95mm ones to 10.3:1 for the 98mms) and can now take advantage of the twin plugging the engine already had.
I would encourage someone to have a good talk with an expert on this subject - Steve Weiner at Rennsport is probably a pretty good start (and a very helpful guy):
http://www.rennsportsystems.com/~porsche/2f.html