BAP

I have a 07 GT 500 my goal is to get to 700rwhp what size injectors would I need, also would I need a BAP

Yes at the minimum you would 56lb injectors, like the ones in the 13-14 gt500 and most likely yes on the BAP but you will get different responses. But yes definitely need bigger injectors.

I am right at 700 and have ID725 plus a bap.

I am at 645rwhp on a mustang dyno jet so I should be close to 700 mark on a dynojet.

Anyway I only have 72lb injectors and my tuner said I am tapped out and really need to add a BAP for piece of mind. Probably just gonna upgrade my pumps instead.

Get the BAP and injectors. It is cheaper than an engine. My FPDC is in the mid 80s range with gen 2 TVS and BAP. I can see it being close to maxed out with without them.

Just wondering if you got the bigger injectors such as 53's or 56 if you would know from the dyno pull where the air fuel readings are ? Then again....even if they are safe during the pull there's a future of hard work ahead for the stock fuel pumps.

Datalog!!! You don't want to see injector or fuel pump duty cycle above 85 percent (safe).
FYI, the 2013-14 injectors are rated at 55 lbs/hr at 43.5 psi, a standard pressure that everyone uses except Ford. Ford's is 58 lbs/hr at 39.5 psi.
Also, do not discount going to larger capacity fuel pumps -- no need to complicate the electronics by adding another component, a BAP.