[GreenBird]

You can't fit a 5.4 crank in a 4.6 block. You can get a 3.75" crank and 3.7" bore for 324cid (versus 330cid of a 5.4) but that's big bucks.

Putting in a 5.4 block will net you low end torque but your not going to make any more (probably less) power than a 4.6. The 5.4 also has very few 2v intake options.

Stick with stock displacement, or get a big bore, or go 4v and get whatever displacement you want.

 

[GreenBird]

How so? Can you drop a 4.25" stroke crank in a 350 block? Can you put BBC head on a SBC chevy block?

The modular isn't different than windsor blocks, my 351 EFI truck makes the same power as a 302 HO motor.