416 Stroker question.

is it now... what about othre differences? the heads have bigger ports and runners? knowing this i suppose i can do a lot more with my 318 than i had originally thought. are the mains the same size on a 340 and 318?
and... could i use a 360 crank in my 318 if i had the mains turned down, would i have to use 360 con. rods..? mebbe i should just start a separate thread...