I've had considerable luck pulliing parts out of Boss wreckers. They have a few coronas in the yard, but not sure they're st141's, could be rt's.
Consumables from the usual auto parts shops, repco, bursons, etc, and Toyota for some of the specific bits. I've actually found that some of the parts aren't too expensive. I usually go to the parts shop at kitchner rd (just off gympie rd). Otherwise, trawl the for sale threads and post in the wanted section for specifics.
Maybe start a build thread to keep the forum appraised of your progress, and look for a corona thread in the general car talk section.
Good luck.
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