Yes, it is the AM radio with the din plug. I have not tried to use it because I was looking at the original owner manual's instructions that require the AM radio to be operative and mine is not.
Ok, I'm sorry for hijacking this thread. I just got excited about the cassette player thing. I know of a few people doing conversions of 6.1 or 5.7 into E body. I have no problem with it, although I know it's not a cheap undertaking.
In response to the OP question, my humble opinion is that if the car was a numbers car like that, I wouldn't do the conversion. But that's just me. I will say that my current GTX is the last time I buy and play with a numbers car. I hate not being able to modify them (at least in my mind). I will go full on resto mod next car, but would do a B body.
Sorry again for changing the subject.