RootesRacer
Donation Time
In the racing Alpines I've watched, the biggest handicap is not having a limited-slip diff. From Ian's postings years ago, I think they do exist, but there are about five of them or something like that.
I think if cross-marque parts sourcing were allowed, that would be the first point of attack. But I don't know for sure if it's allowed or not.
It all depends on the specific racing org and class but in general if you are called on the carpet for what looks like cheating, you will need to provide homologation docs or factory catalogs to support your use non standard parts.
For instance, Solo uses FIA groupings to classify what contemporary group to put an old vehicle into. They also have modified classes where you can do pretty much what you want if you dont violate class requirements.
Most vintage race orgs also follow the old FIA class groupings.
Most real racing groups arent going to let you race an engine that wasnt in that exact vehicle as homologated for that year.
Many vintage groups will overlook a 1725 in a series 1 but they dont have to.
Items for series sunbeams that could be proven homologated include perspex windscreen/windows, spicer/dana 23 powr-lok limited slip (with special axles).
You may be able to convince some orgs that since the harrington had factory twin DCOEs, the alpine could have too.
In short, if you have factory docs that the car could have been ordered this way, you have a good argument to let it race that way.