Just do an LFX with a turbo. Easy.
If I lived anywhere other than Commiefornia, that might be an option. We are severely restricted in terms of engine swaps and modifications for anything after '75. The LF3/LF4 are essentially turbo LFX engines. Still considering my options. Seems like parts to build a 3.8 OHV Grand National engine are fairly plentiful/easy-to-find, so I may stick with that plan.
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