I believe that the blocks are different in at least the later blocks take roller cams .. there may be more than that, one of the other guys will be able to tell you!
.. try pro stroke or www.eaglemotorsports.com.au for your stroker stuff ...
The newer Windsor blocks have taller lifter bores for the roller camshaft but you can buy a retro-fit hydraulic roller cam kits if you want to install a roller cam and lifters in an older Windsor block.
Comp Cams and Crane Cams have those kits.
Try www.vpwmailorder.com they are in 541 High St Epping Victoria
they have stroker kits as well and give you plenty of advice as well.