Elbert,
Mark's is slow to reply, but I wanted to check out the part. If it doesn't work out I'll pay shipping to return it. What I hoped to accomplish was using my Toyota radiator shroud since they chevy fan is larger. I think if everything mounts up right i will have ample cooling. I figure I can at least check it out and let others know how it works.
unlikely you will be able to position the 5.7 to align the fan with the stock fan shroud, its worth a try if that works. I don't recall seeing any of the swaps running that adapter from Marks you mentioned. I still think you might run into trouble with the accessory belt drive. I personally would want to know details on that thing before I paid for shipping from AUS.