How much ET will i pickup with following changes

I think you will probably see close to 0.3, but most of that will be due to the trans swap (and some due to the converter). I think you would see a bigger gain if you replace the Air-gap with a Victor.

On my old 410 with a smaller cam (248/254) I picked up ~ 2 tenths swapping from the Air-gap to the Victor. With your combo I think it would definitely like it.

I had a single plane mopar intake on it, and it ran better with the airgap on it. Just figured only running it 6k like i do the motor liked the dual plane better.
That said, i plan on buying a victor for the 418 motor i have in the works. Remember, the motor in the car now isnt a stroker, just a 360
I may put a victor on this 360 just to see what it does before i retire it though, worth trying.