My opinion of the new Z is focused on the appearance of the car. But now that you bought it up…I’m a little disappointed that it shares so much with the 370Z. Hopefully it works better in the new chassis than the 370 does / did. There’s a reason you don’t see them at trackdays.
I put the motor in while in high school in 1980. The Z wasn’t as iconic as it is now and no one knew it would have a 'legacy' In 1980 it was just another car. We specifically chose the 327 due to the relatively similar weight comparison. If I remember correctly it was less than 25lbs more than the 6 we took out. We also moved the battery to the rear of the car at the same time.
At the time, I wasn’t skilled enough to know if it handled better or not, but all the adults in the local Z and gymkhana clubs said it did.
Would I do it again? I don’t know. If the car was a basket case, probably. I wouldn’t swap a 240, but a 280…all bets are off.