69 Dart / 70 ^ 318 Which Upgrade Kit for Factory Air. Lil Help Here Please

I'm picking my (new to me) 69 Dart up this weekend.. It's a factory AC car that began life with a /6. Previous owner swapped in a later 318 (Alum water pump). It appears that I'm just missing the pump, bracket and lines.. I want to put the AC back in but I'm struggling with which kit from "Original Air" will work for me. They small block upgrade kit is for years 65-69 65-69 Dodge/Plymouth Small Block A/C Upgrade Kit STAGE-1 and small block kits for 70-74 70-74 Dodge/Plymouth Small Block A/C Upgrade Kit STAGE-1 I'm assuming I'd want the 70-74 kit and run dual belts across the crank/compressor/alternator. I'll also have to switch alternator to the dual pulley and change the spacers.

Am I looking at this right? Thanks

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