I would be more impressed if they put the old straight 6 back in it.... those babies had low end torque forever... and they were indestructible.
The 258 was one of the best. If I can ever get another late model, an in-line 6 is what I would like.
I’ve had a few with 304s and they all sooner or later suffered from blown lifters. All mine were used and I did my best to do regular servicing on them but none of them were exactly the most reliable engines ever.
I drove one with the Buick 225 V6 a long time ago. That little motor had a lot of get up and go.