To remove/replace the engine on a mid-90's G series van, you must remove everything in front of the engine, from grill to radiator, and remove it from the front. You may need to remove the motor mount to crossmember bolts to allow the engine to move forward. It is best to keep the transmission bolted to the engine, as it will be easier to align, etc when you are ready to reinstall it. Keep in mind all the lines and wires will need to be disconnected, too. Get a Chilton bok and use it for reference.
350 4 Barrel is what is in mine
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G20 is a 3/4 ton and a G30 IS A 1 TON
That year sets at ZERO TDC.
Look in the removable housing at the engine end of the upper radiator hose
It is 2701Kg Yes The G30 is a 1 ton.
easiest way is to send it to a mechanic shop
Follow the top radiator hose to the engine and you will see a housing that the hose clamps to and it will be under that housing
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In the alternator
41 to 47 psi
That's what's commonly referred to as a 454... it's a big block engine of 453.96 cubic inches.