Brake Conversion Options

I've got a 65 Dart GT Convertible with a 318 and a 727 with a Gearvendors. It came with Manual, single reservoir MC, Drum brakes on all 4 corners. The rears are 9", not sure about the front but I'd assume the same. I've got a leak somewhere at the rear, and I was about to just replace wheel cylinders and shoes since everything else looked fine, and now I'm thinking I may as well start on some sort of conversion.

For the rear, how much is required to swap to a larger size drum? I'm assuming most everything, backing plate, wheel cylinders, shoes, springs, self-adjuster, other hardware. I've got stock steel 14" wheels, so would I only be able to go up to 10"? Lastly, would that even be worth it?

For the front, I want to eventually get to front disc brakes. For a short time I may just work with the front drums, mainly just to drive it around the block and test things, but front disc with a dual reservoir MC is definitely on my list. This is one of the kits I was looking at, but I'm open to any ideas or if anyone has used this kit and had issues that'd be good to know. This does say that I'd need 15" wheels, so if there's a kit where I can keep my 14" wheels that would be better.
https://www.classicindustries.com/p...lnDJqa-wLCDQR-ODStlWJ1Ks0XCyXrbicAaAsHjEALw_w

This is another kit I saw recommended, it says it fits most 14". I'll have to measure mine to see if it would fit in with mine, but it also states it is a manual system.
1962-74 Dodge Dart Mopar A-Body Front Disc Brake Conversion Kit for 5x4.5 Bolt Pattern & Manual Brakes

I also would like to look into power brakes for this, so options/opinions on that would be appreciated. If I end up with one of the above kits which both say they are a manual system, I'd just need to replace the MC and add a booster to make it a power system, correct?

For now before I order anything for the rear I'd like to see how much harder it'd be just to swap to 10" before I go buying parts for the current 9" system.
You say you want to keep your original wheels, yet you post links to kits that convert to a 5x4.5 bolt circle. Your stockers are 5x4.
IMO, skip Classic, skip Pirate Jack's. Skip EBay kits.
Go directly to Dr. Diff. Do not pass go, do not collect $200.
Call Cass and tell him exactly what you have and what you want to do, he can set you up with everything you need. Best customer service in the business, and his stuff flat out works.
Quality Body Shop Drivetrain