Filled block on the street?

I just tore down a 1/2 filed hard blocked 340 with 20000. miles and a spun rod and scufed bearings, the cooling sistem was 3core radiator all the shrouds and dames in place. on the hiway the oil preshure would go just below the 10psi to 1000 rpm numbers. had stock pan. you could not cruzse above 70 mph with this car (3.23). temp was tied to the speadometer. I dont think i will do it again. if you must a large pan and oil cooler would be my choice.anyone want to buy a 30 over 340 with hard block half way up.