Good day to you all

I started disassembling my 1931 Scout engine. I found the pistons that are iron, i believe +0.50 or 74.45 mm. And weighting 637 grams each (with the pin). Only two compression rings were on the pistons.

There is not so much wear or damage in the cylinders

Now i am considering my options. The engine will be rebuilt fully

Should i go with what i have and  +0.60 pistons? . Or should i go  and sleeve my original cylinders, or purchase new repro cylinders?

If i decide to buy cylinders, The options are cheap(er) cylinders from India or good expensive ones from Poland. Any experience with that? 

As far as combination with  the bottom end:  Do i only have to use iron pistons or the motor can be balanced with aluminum pistons too?

Did the engines with the A after the motor number had different (lighter flywheels?) mine does not have an A.

Also 

Would someone consider the option to make the motor 57 cu inch with different flywheels and relevant pistons (or same pistons are used?)