I am currently on my 7th year extension, based on my pending perm. How early can I apply for 8th year extension?

Yes.

Need to do conversion from L1B to L1 A or H1B

Your employer should be having this conversation with the immigration attorney along with you.

Is there a grace period after h1b job termination?should i change my status the next day after my job end date?

There is no grace period. You must file the change of status BEFORE your H-1 with your employer is terminated.

Can I overstay my J1 visa and still get sponsored on an E3?

No!!

Is a nonimmigrant visa number the same as the I-94 record number?

No. nonimmigrant visa number is on the VISA itself I- 94 is on the white card or retrieved from the CBP website

EB 2 qualification - 5 years experience inside or outside of USA

It doesn't matter if it qualifies as professional experience.

DO my wife need to aplly for k1 visa before apply to i601 waiver or just the waiver wold do it?

You should make an appointment and see an immigration attorney in your area to discuss your case.

My wife and i have received a request for more evidence from immigration.

Yes, you need a lawyer, who has experience in such matter.

Is it safe to travel with advance parole for daca ?

Probably not.

Selected as the best answer

A person who came to United States legally and doesn't have status in present , can he or she apply for get legal through work

Probably not.