To dyno or not to dyno?

My guess from racing 318 engines in stock for 50 years
and dyno work would be 330 to 340 HP. the compression
does not help (especially if they are down in the hole 50 or so)
and I do run much more duration. I am able to get 400 HP
plus on that size and compression engine in Stock Class,
but my camshafts are way bigger and I have a lot of
development time over the years.