You have a lot of options here.
One would be to see if you can get some nice looking centers for the Rally wheels. Try the parts wanted area. Never know!
Aftermarket wheels for SBP are pretty slim pickings. Just not a lot of options.
LBP opens up more options. Many more options. Bigger brakes like bigger wheels. 14" will put you in a postition to install some OEM disk brakes. Doing a custom disk brake conversion is always an option. I went with non-power OEM Disks on the Valiant.
That being said, I run LBP F-body wheels on the Valiant. (Wider) With the beauty rings on there, they look pretty good. Far from custom, but you just don't see them much. For a rear end, I installed a Ford 8" from a 1971ish Maverick. Drop in. Couple that with a custom built drive shaft with a ford rear U-joint, and I buy over the counter repair parts instead of playing mix and match to build a conversion U-Joint. (The conversion U-Joints are to use a Ford driveshaft on a Mopar rear.)
For Linda's '63 I have a set of SBP Rally wheels. They really do look awesome!
See if you can get the centers first. Aftermarket wheels just don't give that classic look. Pretty, yes. Classic, not so much.2¢
CJ