Building a bike (Question on fit)

Hi everyone,

Currently I’m riding a Trek Eq 7 ( sz 56 ) and have an opportunity to build
road bike with a Felt F25 frame ( sz 58 )

Does anyone have any suggestions how I can guess-timate whether the Felt
will be too big or not ? I’d like to have a better idea before I put all the work and
money into it.

Felt Geometry is here: http://www.spaso.com/felt2005/f25.shtml

I’m an amateur when it comes to bike fits so any help would be great.

Thanks.