Just saw this on Ebay. Claims standard bore, looks to be rope rear main (terrible pictures though) so HJ onwards. Might be worth a punt for someone here if you can get the engine number. It may well be a blue or black motor too, or a Commodore red motor. Engine number will tell all.

http://www.ebay.com.au/itm/308-Block...1#ht_63wt_1170

Lang Lang, Vic. Currently $222.50, 16 hours to go.