As already mentioned 14” wheels can be an issue.
Compounding that issue is the fact that 1966 14” wheels were designed to only work with drum brakes. By 1967 there was a disc brake option so the barrel of the wheel was redesigned to add brake caliper clearance.
Also keep in mind that not everyone checked the box on the order form for the optional discs so most Rally 1 wheels will be drum brake only. Maybe I’m wrong but I don’t think that they just started putting disc brake wheels on everything starting in 1967.
Aftermarket kits even when used with 14” disc brake wheels usually have clearance issues. Most manufacturers or sellers will tell you to use 15” wheels with their kits for this reason.
So I’d say using your drum brake Rally 1 wheels with either aftermarket or GM disc brakes is a non-starter. At the very least you’re going to have to search out a pair of ‘67-‘68 Rally 1 disc brake wheels and then deal with the hopefully minor caliper and caliper bracket clearance issues.
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1964 Tempest Coupe LS3/4L70E/3.42
1964 Le Mans Convertible 421 HO/TH350/3.08
2002 WS6 Convertible LS1/4L60E/3.23
1966 VW Type 2 Single Cab Pickup 140hp 2276
1956 VW Type 2 Panel Van 36hp 1200
1957 VW Type 1 Beetle 180hp 2276
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