Yea you can put 4v head on a 2v but WHY? Kickerstang-like Aaron said.The 5.0 you can get parts cheap but anything around 450 +rwhp and the block is gonna split. Plus the 5.0's blow headgaskets like crazy because of the block design if the tune gets out any. 4.6's dont. With less money than it would cost you for all that im putting down more power than a good 5.0 with a power adder including some strokers with blowers.And i have lots left in mine. Mines emission legal,daily driven,looks stock.