What kind of speeds will a Daytona 28 TD with stock 454 mags(385 hp EFIs) see in good chop? And how big of water can it handle?

In perfect conditions it should do 81-83mph
as far as water it can handle, All depends on the conditions. It should handle some pretty rough water as long as the driver doesnt get carried away. All these cats handle rough water once ya learn to drive em. Its taking me roughly a year to get a good ride outta mine at LOTO and its a 25 daytona. But I am looking to go bigger.

That 28 is such a good deal you can afford some low boost whipples for it

I was considering that boat myself but my wife got hooked on canopies

Seeing how it's about the same price as a lot of 25s out there I thought it was a great deal too. But, it actually seems to be priced about right. There are just a lot of overpriced 25s out there!

Either that or some people have to get rid of their boats and others dont.

That may be but most of the 25s out there are way overpriced. I know you have yours for sale with a ton of extras but a lot of them don't. A 1999-2000 25 isn't worth $50k+.

So back to the original question. A 28 will run 80+ with 454s and step over some rough water. But how big? Most of the time I run in 2-3' washing machine slop which I know this boat would chew up. But I do get out in the bigger water where I can see 4'+ slop and some 5-6' rollers. Can this boat deal with the rollers like a deep V?

Where do you do most of your boating? It will handle the stuff just as well as a V of the same size and weight.

I boat in Northern Michigan. The inland lakes will be no problem but I go out in Lake Michigan(and want to get out there more) and you see 4-6 footers out there quite often.

4 ftr's will be a minor problem but very dooable.
6 ftr's... Hang on..........