In high school I had a 1986 z/28 with the LG4 305 and t5. I swapped to an older style (non cc) hei distributor, performer rpm intake manifold, and 1406 edelbrock vs carb. I did have stock gears though (cant remember what they were). This set up worked great and I would recommend it to anyone. You may see a benefit from a mechanical carb. I would stay in the 600 cfm range though.
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