Yes it will bolt right up to it.
The fuel lines around the filter; you will need an adapter.
.043
.43L. 1000ml=1L
It should be on the front of the intake manifold directly above and behind the water pump.
Don't know what year you have but some sensors are temperature sensitive and you should run a 195 degree thermostat.
4L60/E l
43L of 18-k gold
There is one before and one after the catalytic converter.
What year is the gtp, if 95 or newer yes, if gtp is in the 80's then no due to pollution restrictions today, and may have to change the computers from each vehicle. Each computer is set to specs for the engine it controls.
The EGR valve on your Astrovan is on the backside of the intake manifold just under the throttle body attached by two bolts. After installing a new gasket be sure and torque the BOLTS to 17-18ft lbs or the NUTS (if yours has studs) to 15ft lbs)
There is no adjustment required, but you can clean it with a carb cleaner.