My 71 demon came with a Holley. Same base pattern as a bbd. Not sure how high it way. Kim
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What is the intake manifold?
The 1970 single plane intake manifolds sit pretty low, that may help.
Here is a picture of a dual plane intake below for you to compare to.
View attachment 1716033064
This. The height difference between the early and later, about 73 and up maybe (?) and the 72 and down pictured is significant.