hey, don't change the whole motor do a pi head and intake swap, you will gain more power than a stock pi motor. this is because the 96-98 4.6's are 9.3:1 compression, the 99-04 are 9.7:1 compression, with the pi head and intake swap on a 96-98 4.6 the compression is 10.6:1. the block and heads...