SLS would still use SSME RS-25 engines for the core stage, but having F-1 powered liquid boosters on the sides instead of the current five-segment ATK solids would be interesting.
Activity from last night and today:
Discovery demated from SCA using crane contraption that makes me nervous
Enterprise rolling out of Udvar-Hazy Center
Discovery approaching Udvar-Hazy Center
Enterprise and Discovery meet for the first time