O.K.,
Just purchased the Offy. dual singles manifold. My question is: Can I use the single from a 70 truck motor that had a manual tranny as the second carb? The set-up is going on my motor from a 68 Dart 225/904. If not, what do I need to look for? Thanks!!

You really need to have identically-matched carbs on any multiple-carb setup. There's enough difference in internal calibrations and sizing even among the many, many car variants of the BBS...differences are even larger between car and truck variants. Mismatched front + rear carbs will allow the car to start, run and drive, but it will cost you a considerable amount of performance and fuel economy since you will wind up fruitlessly chasing weird driveability/performance problems caused by the mismatched calibration.

And I'm not just saying this because I have a matched pair of brand new, not rebuilt 1bbl carbs for sale

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Like Dan said,you really need to start off with 2 identically calibrated carbs or you might end up chasing unexplained problems.

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72 Scamp dual 1 brl