Why are there so few blown small blocks?

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I run an 8-71 on 3.79 stroked 360. Intake manifold is cast by Max Wedge Performance in Australia.
Nice thread!
That's nice that a 8-71 will fit, with my offenhauser manifold my 6-71 is up against the dist and the only way I could fit an 8-71 would be to buy an offset distributor which are expensive.