BBP help for my 64 dart

I'd like to upgrade to bbp on my 64 with the stock 225.

I bought a 7.25 bbp sure grip unit that has the springs and brakes. I found out there is no replacement parts for the sure grip so it may not be worth messing with.

My next option would be to get a 7.25 without sure grip bbp.

I've also read that the 8.25 bbp would be the way to go but I would need to cut down my drive shaft.

I just found a 8.25 bbp sure grip unit but it doesn't look like it has the springs or brakes.

I'm basically looking for the easiest upgrade.

Any advice would be greatly appreciated!