I'm building a '65 right now, and you're somewhat limited on how big you can go on tires. Even with a DSE mini tub, which relocates a section of the frame rails slightly inboard, you are limited to a 315 out back. If you want bigger then you probably need to look to Art Morrison. I just installed an Aluma frame, and if you are at all interested in one and have questions I'd be happy to answer them.
I dont want to Hi jack your thread so I will post some pics on my thread in interiors section as soon as it get it delivered, Owner gets to see it first,