Ripet, I have one of these. I acquired it in my mid teens for around £400 GBP and it was 87/88, so not quite sure where your 1978 came from!
I am only around 140lbs so the frame was not under any particular strain and I can't recall hitting any serious potholes. I dusted the bike off recently from where it has been hanging up for roughly 20 years! Frame is in excellent condition and the aluminium joints and forks always polish up great to a high sheen. In the last 80's I added a full 105 groupset. I added lately some modern 105 shifters and I am about to do a full refurb with some new parts. Do you have any info on decals? I saw some on eBay recently but the colour doesn't look quite correct. The tubing itself is a little scratched and I would like to do something about that, I think it is brushed aluminium but not quite sure. I struggled to find a 24mm aluminium seat post but managed to squeeze a shimano 600 post in somehow. I'll probably have the wheels re-spoked and have the rims polished, mine are holding mavic velotech (original spec). I went for a more modern front stem. The chains I have is quite aggressive, running a six speed on the back and a 41-52 on the front, making for tough climbing.
Anyhow, being a couple of kilos heaver than a modern carbon frame the bike is nicely planted on the road and gives a very smooth ride indeed. I'll post up the photos when I've completed the refurb.