Maybe the fact that I'm well over 6 feet tall helps explain why I don't think chopping the top is a good idea.

But I think half the appeal of that chopped-top coupe is the dark windows. Darken the windows of the stock roof car and you'll see what I mean.

As for the engine, do what you wish, I'm not paying for it. I think you can save around 300 lb off the front end by using a new Hemi, and make as much usable power.
Note, I said usable power.

Weight distribution will be much better and the car can be made to go around corners, which would be good in my experience, as I drive mountain passes a lot. Like I was doing last night, Wolf Creek Pass in the moonlight is really cool. Wish I had something that handled better than my '64Dog D100! The rear wheel steer from the leaf springs can be a killer.

Anyway, keep it a coupe whatever else you do, I think the fenders add to the character of the car, though.

Congratulations on scoring the best looking coupe!

R.