Have listed a set of L31 stroker parts listed on trademe that may be on interest.
LD28 Crankshaft
http://www.trademe.co.nz/Trade-Me-Motor ... 968208.htm
240z rods (133mm) - with 9mm pins
http://www.trademe.co.nz/Trade-Me-Motor ... 966850.htm
89mm (KA24) pistons
http://www.trademe.co.nz/Trade-Me-Motor ... 969527.htm
L28 oversize 2mm 5 layer Head Gasket for Stroker Build
http://www.trademe.co.nz/Trade-Me-Motor ... 971044.htm
N42 Block