Why are there so few blown small blocks?

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Well you can run a “front offset” blower. The extra length is added to the front providing the exact same distributor clearance you have now. There’s no additional charge for an offset blower, it’s just assembled backwards.

Indy’s offset distributor is around $800 and is required with their ModMan manifold unless modifications are made to the manifold and blower adapter.
Besides one must add a pop off valve to the ModMans intake manifold


You'll still have to notch the firewall with the offset drive.