906 heads and 740+ NA horsepower?

I still have a set of 906 heads that I ran 9.80’s @ 2800 pounds back in the 1980’s. This was on a stock crank, stock rod, TRW piston engine. They will probably get junked after I’m dead and gone but I just never cared to sell them. They could even be better today with smaller valves (still 3/8 stem).