All the different engine displacements used the same exhaust manifolds and intakes as well.
You'll gain right around 8 HP with the RA/HO manifolds over the logs on a stock engine.
Pretty sure in '68 the flapper valve was still being used, by '69 it was gone.
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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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