I'm trying to take the redeye 1743 SFO-IAH then connect to 2606 IAH-MEM with a 56 minute layover.

Kayak tells me 1743 is only 70% on time...do I chance it? I'm not going to check a bag, and have changed terminals at LHR at a good 10min/mile run, but having never been to IAH...can I make it? Do I factor in the chance of lateness?

Thanks!