[Reed]

or a 3s-gte

for the sr20 you will need to make engine and tranny mounts/crossmember?, not sure if your corona is carburated but the sr20 will need the ecu and a bunch of wires/harnes. the shift linkage for the new tranny.

the 3sgt3 is a turbo motor and the 4agze is supercharged and there is a good chance that either of these could bolt up to your tranny and if your lucky maybe even the engine mounts, at least with one of these options you wont need to worry about shift linkage.

but if you are dead set on getting the sr20 in there good luck that would be pertty original, i have never seen an silvia powered corona, actually i have never seen a corona powered corona.