You see quite a few W2 small blocks but not W5's. Must be too big of a hassle to make them work. There was a Duster at the track a few years ago with a NASCAR Truck engine but he could never get it to work well.
i ran W5 heads. Make great power. Modern cylinder head has a good CNC program for them.
You can make an Indy intake work on them.
Problem is the castings are pretty lousy, unless you get lucky. Porous.
They are capable of making 700 horsepower with the right combo. I made 650 with mine, guy that bought my car later made 700 with them
