You'd be better off with the '67 with the dual carburetors. The worse year was 1968...the first year with fuel injection. The fuel injection was added because the dual carburetor set-up couldn't pass the newer fuel emission control standard. With that year there was a built-in hesitation when accelerating from a dead stop. The '69 wasn't much better. The fuel hoses have a tendency to rot. The original 1968 through 1972 engines had too soft a crankcase material. Head studs would pull out of the crankcase. Perhaps by now most of those old crankcases have been modified with the case inserts. The air intakes were modified to suck in air more efficiently...basically by turning the louvers around. The various electronic sensors for the computer operation had a tendency to drift away from acceptable values. Testing each one separately, each sensor would check within limits. However, testing the system as a whole would indicate most values out of limits.

Keep in mind that these tests were done with the factory equipment available at the time. Since 1975 (the last time I worked for VW) many things MUST have improved, but back then I hated working on the fuel injection systems on the '68's and '69's!