I have been examining teams from other leagues, and I notice that, even though dead ball era P's HR+ numbers are rather low (numerically), they don't seem to allow as many HRs as modern day Ps with comparable HR+ numbers. What numbers can we reference to get a reasonably accurate projection of a P's propensity to allow the long ball? Also, are P's rated for "invisible" stats, such as the extra base hits they allow?