By "few tweaks", I meant that trying to convert a Pershing hull to make the M88 would not be a matter of just a few tweaks. It would be a significant endeavor, if even possible, especially since the shape of the hull is very different.
Thanks for the correction on the M88 variants. I wasn't aware the difference between the M88 and M88A1 actually moved between the M48 and M60 chassis.