[RACER X #99]

Curt,
Not familiar with the sportsman block, does it have 4 bolt mains like the aftermarket blocks?
I had a 351 Crate a few years back and I beat the crap out of it on the track. I shifted it at 7,500 all day long and it finally blew up and the only thing I salvaged was the manifold and water pump.So I don't have a lot of faith in stock Ford blocks.(for track use)
The World Products and Dart blocks can both be bored to 4.185 and still maintain a .250 wall thickness. I also like the fact that they have priority oiling.

RD