I remember Simcas, 1301/1501 saloons & the hatchbacks/vans(i had a Simca 1100 van, rattly reliable but not an Avenger Dash.
if you mean the Hilman Avenger then right. Lotus Sunbeam was a Chrysler, sme as Avenger, Alpine and Rancho, all had the same basic mechanicals, Avenger was modernised with bits added on the front and rear wings but had the same dash as the others, though retained old mechanicals, the Matra, Sunbeam and Alpine were all simca's. The Lotus one was different mechanicals. Russel Brookes had one and I have driven the Sunbeam, Escort MK 1 and 2, chevette and Manta rally Cars when I worked for Andrews Heat for Hire.
The Avenger was a early 70s modern small car, designed to be easy to make and easy to work on, CAD was used too!
4 door saloon, 5 door estate, all coil sprung, live axle, well designed push rod lump.
It was the last all new car from Rootes group.
The Sunbeam is a hatch version of the Avenger with a shorter wheelbase.
The Horriblizon and Alpine are more Simca based.
Ones to look for are Avenger GLS, GT and Tiger, Sunbeam GLS, Ti and Lotus.
There are a lot of hybreds out there, most are now 1600 even if not built as such, and most of those are modified. Most have also got higher spec trim (or are stripped) - usual thing of getting the nice bits from the scrap yard.