Hallett ,what makes a CJ is the heads ,not the block.The SCJ has a different head altogether as well.I think all 429/460 blocks were cast in Lima ,with different deck heights ,but they're basically the same.The letters inside the block doesn't mean it's a CJ.I'll check my books at home later.In the meantime Mr460 or 058 might chime in with the proper info.Fomoco's offer is pretty good,and I would get forged pistons for that one ,if you'll get it.Later