I'm not sure if I'm missing something here but many many yrs ago, hell decades ago I went to Mancini's shop in Detroit, (original one) and bought (no less lol by mistake) Race prepped heads, instead of the econo heads and still have them Never used, not even bolted on to an engine to check specs etc.. All these yrs later,. W5,8,9 etc and they still are for small blocks and for mopars.
Never heard of Chevy W2 heads for Chevy....am I that far beyond with technology ?
Thanks.