Gearheadeh, My father (Russ eyres) and I(Eric) built that motor and many versions of it over the years. We currently have two, one mech. fuel injected, and the 2nd is turbo charged with a FAST electronic fuel injection. Both have gotten records at El Mirage dry lake in recent seasons.They are stroked 350 Ci Chevy's, using the even side only. Standard 90 degree cranks, and conventional camshafts, motors are completely dynamically balanced, but are odd fire, so at certain rpm's the do shake!!! We have thought of building a new SB2 style, but to many current projects. for the longest time it was a easy 3 litre engine, but lots of new 3 litre alternatives these days. The flat heads covered an aluminum plate that bolted to the block and intake manifold.If you have any questions come see use at Bonneville( entries ,832,866,131,2) or look for a San Diego Roadster Club member, they will point us out. thanks Eric eyres