I bought and built a new World block 4.180 unfinished bore block several year s back for a local cutomer at his insistence, I wanted to use a 4.490 bore unfinished block I put a 4.250 stroke Ohio Crankshaft CO crank in it, 7.100 long rods and Diamond pistons for pump gas, Mopar crate motor single barrel four dual plane inatek and, I beileive, a 850 Demon or Hollet D.P. carb. he had the carb and air cleaner and they put them on after the motor was in the car. I wasn't aware of the stud problem and don't remember having problems with them torqueing properly He's been beating on it pretty hard for several years now and no come backs yet I ahev a older World Block, I think it is,maybe a earlier mega block for another project in the future, I hope it has good studs in it If not they will get replaced