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I just put an F70 on my 1963 custom (originally a Currituck).
I have a center console, leaning post, batteries (2) in the console, and a 22 gallon gas tank under the leaning post.
Just like you, I went with an aluminum prop. I used a 13 1/2 x 15 Yamaha #6E5-45947-00-00.
The dealer set everything up and I could not be happier.
I can not answer top speed for you, I am not out of the break-in period (10 hours) so I haven't been at WOT.
I can tell you that with three adults and the dog on board, there is power to spare. The boat floats on its lines and looks like a Whaler should.
You will love your F70.

Best of luck,
Gary