to correct Black_jack: this is an easy swap, that can be done even with nonFord 3l block, no matter the transmission, you even have multiple routes.. you can fit the old heads and intakes onto the 3l block (so-called hybrid), or go the full 3l swap route.. there are also other combinations, like 3l block and heads with ST200 UIM etc...

basically you just swap the timing cover to keep the aux stuff there, keep the loom, ECU, do only minor mods to the new block and voila, there you go a 3l up and running