Carl,
The only Aftermarket Blocks I fool with or shall I say most of them are a version of the BB Chevy mostly. Most or almost all of my SB Customers are still stuck in the stock blocks. So when I am tootin Dart's Horn it is from experiences with BB Sportsman, Billet, and Race Blocks only.
I do have a few customers with SB Little M and Iron Eagles, but they already had them before I began working for them. Same as the World Blocks I have to work with. I got burned and burned up several years ago by a deal they did me wrong on, so that soured me from ever buying from them again.
I have another one of those big heavy monstrously thick 11.625 (actually this one is currently 11.629) World blocks here now that has taught me all over to not like World Blocks. It took me forever and a nightmare to make room in this thing for a 5.500 stroke, but World claims it is good for a 5.750 stroke.
If we were closer, I would like to try your services. I know that I don't like the line honing or the Lifter Bore work from Reher Morrison. I guess it all seems to work ok in their engines they build though. Disapponited the heck outta me, I will tell you for sure and it wasn't cheap either.
Ed