cab, funny you should mention those M/T hemi heads. i recently read an article on thompson, and there was a little about his hemi head development for the 389 motor. it was interesting. he also sawed a 389 in half, creating a four cylinder engine. a hemi head was installed on that and raced at bonneville. i can't recall where i read that. i'll have to look. it wasn't the first time i read about his hemi head work on the pontiac engine[s].