Thru the fuel-filler nozzle...
Yes you can.
87 octane
I put 275 25 24 on my 86 box chevy caprice
yes
yes I can.
it should be in the gas tank..
87 octane
its a Chevy
Yes.
if it has a 5.7 ltr then yes the bolt patterns for the 5.7 have been the same sense there firt production.
a 22 with out a lift kit
yes, if your caprice has a v-8 the motor will bolt directly to your tranny, just put a new fuel line on and run the carburator, junk the tbi