I wouldn't say a 4dr needs the Type 3 engine, but a wagon would certainly benefit from it. So would the Type 2 (especially any pickup variant). I don't say it hurts a 3/5dr, but it's not essential, IMO. I contemplated a 3/5dr, but I'd do it a lot sooner than 1966. I'd also go to all-strut a lot sooner, too. TBH, by the '70s, VW should've switched German production to watercooled already, like the Passat (Rabbit), with *Supers for Mexico & Brazil, & maybe India, all locally-built. That also presupposes they'd be EFI & electronic ignition, which VW could easily have led on, & didn't. It's possible the OTL Type 1 body style is retired in favor of the Type 4, with the Type 3 engine, on a slightly modified Type 1 pan, for Latin America & India (& North Africa?), quite early compared to OTL's Type 4. The *Passat could happen sooner, too. I've seen proposals for an under-seat mid-engine model that intrigue me, but I'm damned if I can recall the designation... That's getting pretty far afield from what OTL VW management (or anybody, really ) is likely to agree to, tho.