In the old days B bodies were popular, the "Big Block" thing and all. A bodies were close behind but think about it a 65 Barracuda with a "273" Or a 69 Charger with a "383" which would you have? Anyway,B body prices went through the roof with rusting hulk 68 Chargers going for stupid money, the A body was a natural progression. They are drying up also that's why so many 340 Duster/Swinger clones etc. The Barracuda formula S is a nice A body . Finding one that isnt butchered and is complete is the challenge. Even my car had a 318 that wasnt original in it when I bought it in 93. Those early 70s "fuselage" B Bodys were very popular.