Welcome to RTA!

This looks doable, but not with any kind of time to actually stop and explore anything in detail. However, this is no big deal in Death Valley, it's going to be HOT HOT HOT and spending any kind of time out of the air conditioned car is not advised.

Fastest way to DV from LV is NV-160 to Pahrump, then Bell Vista Avenue to Death Valley Junction, then in the park on CA-190. This is about a 2 hour drive.

Leave the park on CA-190 west to Panamint Valley Road, take that to Trona Road into Ridgecrest, find a hotel. From the park exit, this is a 1.5 hour drive. Keep these numbers in mind, along with sunset time, so you don't have to take that road in the dark.

From Ridgecrest, take CA-178 west to Lake Isabella, then CA-155 to Wofford Heights and on to CA-65. 155 is a winding mountain road and has great scenery. Take 65 north to CA-198 to get in to Sequoia. This could take 4 to 5 hours. 198 through the park is the Generals Highway, you can stop and see the General Sherman tree. You will probably not have time to head on down to the end of Kings Canyon.

From the park exit, it's about 1.5 hours into Fresno on CA-180, find a hotel. It's about 4 hours in to LA via CA-99/I-5.

You can research both parks in detail at NPS.GOV.