For the PAF, the ideal mix is having a total of around 100~110 F-16A/Bs and 50~75 F-16C/Ds in total. This was the original trajectory if not for Pressler. It would likely keep a lot of those airframes in reserve too so as to keep a core fleet of 90~110 active at all times.
The good thing about the F-16A/B variants and the Block-25/32 C/Ds is that Turkey has the access to carry out ÖZGÜR upgrade on those variants. For the Block-52, the PAF would need to get the F-16V upgrade. You get those upgrades plus the 5,000-hour SLEP on the F-16C/Ds -- plus the J-10s and JF-17 Block-3s -- you'd gain a superb 4+/4.5 cadre to both hold until the NGFA comes online and, later, complement it effectively.