Looking at the pics. u already have the magnetic distributor. The airbox is from cultus which is wat u said. cant u get a toyota original?? Hope u have original toyota carb. I can see a CNG insert thingi in the carb? ur car isnt CNG though. THe leaks dnt look that bad from pics.
Things i would recommend
Get the carburetor serviced by a pro.
Get the tappets adjusted.
Check ur spark plugs.
get ur tires checked.
one important thing is driving style. its very important for fuel economy.
have u tried checking the mileage on highway? cheers