races outstanding are:
CA 52nd (D 50.5, R 49.5) (2500 votes)
AZ 2nd (D 50.1, R 49.9) (600 votes)
NC 7th (D 50.1, R 49.9) (500 votes)
there is one other undecided race, R vs R in LA (so that is going R)
Current decided races are 198 vs 234 (which includes the R vs R)
The likelhood based on current inforamtion is the remaining three all go Dem.
that leaves 201 to 234 to make the 435.
That's a gain of 11? way past my guess of 6-8.
And yes, were one to flip 17 seats then the gavel changes hands. Important to note is the BlueDogs have largely been flushed, the remaining Ds are actually Ds.