You probably still can go with a turbocharger. If you can do the hot/cold side fabrication you may even be able to do it nominally for the same cost as the torque storm.
I’d start with the pre-fabbed turbo manifolds that are available and look at a BorgWarner airworks series turbocharger. Something in the s470-480 range are typically sized appropriately for a 460ish in Pontiac. One of those things will give you the ability to make enough power to split the block.
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-Jason
1969 Pontiac Firebird
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