Many of the old op amps used lateral PNP input devices
which have a very high emitter breakdown. This makes
them good for general purpose use, which might include
high differential voltage. High speed, or high DC performance
(Iib, Iio, Vio) op amps on the other hand will not use those
lousy (but tough and cheap) devices. To the subject, most
PNPs will not let you put 40V Vbe on them. Whether you
need to emulate the 741 form, or its full functional envelope
(or both / neither) is something for you to think about.
Being as the price difference between a jellybean op amp
and a transistor is less than the postage, you might want
to pick a challenge with greater reward.