1: Yes, many have a Windsor 302 or stroker version such as a 347. We have sold several MK IIIs that have the 8.2" deck block
2: The 289 is a very nice cruiser and in fact is my personal choice. I have had my Superformance MK II 289 street roadster (hate the "slabside" name, nothing flat about it!) and it one car I will not part with until I take the dirt nap. We currently have a very nice low mile 289 on consignment, 347 with five speed, all options and many upgrades for well less than current replacement cost.
We would be pleased to provide you with any information you would like,
info@timemachinesauto.com