Dan,I'am sure some will have an interest like the guys that go for the big Sonny's,Kasse's,Fulton and other exotic engines but the market would be limited to those with highend budgets.The more basic type of engine has a larger market.Lose of one or two small budget bracket customers and a business can survive,lose of one or two large budget customers can and will certainly effect your bottom line.After all it's not just a 5" bore space block its everything that goes with it that will drive the cost to where only a few will can play.