As in high end China race stuff or real American race parts?
Did you get a R block with American brand after market race heads?
Or is it a stock block blue printed and ready to assemble with the pistons, crank, bearings, cam and so on?
I would ask around $6000.00 more for a R3 block with a really good set of ported high end heads and all good race parts in it compare to a stock block with stock big valve heads set up as a decent 600 HP bracket race motor