New owner!! Have a few questions!

[Destroyer]

HI and welcome to the site. Good to have you aboard.

As Phatdaddy has said, Photobucket is now charging for use of their site. Use Imgur instead. Works better and it's free.
As far as the height goes, it's inconsequential for performance, but the higher height of the 25" will keep more water out of your engine and boat. It's the main reason manufacturers switched to the 25" and even the 30" transoms.
As far as the transom goes I personally prefer the pourable type. If you want to replace the transom with a new wood core you'll have to cut out the inside fiberglass skin for access. (NEVER CUT THE OUTER SKIN) With the pourable you just need to remove the old wood between the inner and outer skins. (chainsaw and a long flat skinny piece of metal with a "L" bend on the end will become your best friends) Much easier and no problems with trying to get the proper curves in the new wood, etc. Plus, you'll never have to worry about the transom rotting ever again. Yes, pourable will probably cost a little more, but it's a small price for the peace of mind.
As far as the floor goes, that can be caused by rotted stringers or rotted wood under the deck. (or both) It will involve removing the deck to accurately determine the cause. The fix is straight forward in both cases. Just remove the rot and replace with new wood. (Use pressure treated or marine grade.

[PhilBrame]

Thanks for the tips! Phatdaddy, it does have a 85 Johnson seahorse on it but it needs more work than it is worth in my eyes. I want to got to at least a 150 hp. It will be used as a duck hunting rig so I need plenty of go when hauling buddies and gear.
Destroyer, I appreciate the input. Where the floor is weak is where there are no stringers. I think the plywood backing under the floor has given up to years of use and exposure. I plan on pulling the cap off and fixing any issues. Looks like I will have to budget for a pour able transom material.

So seacast vs others that have been suggested?

[jrisapirate]

Spent a lot of time with my roommate on Lake Norman when I was down at ECU. Love it out there.

[Destroyer]

If you remove the wood under the deck, when you replace the wood DO NOT use a single sheet. The best fix is to glue irregular rectangular pieces next to each other, (like a jigsaw puzzle) to the underside of that deck, then fiberglass a thin sheet of cloth over the whole thing to seal it from water. (The idea is to not have any long, straight seams. That will make a weak spot at the seam when being walked on from above).