6.0 or 6.2 LS motors are the way to go - get one out of a wrecked truck or car.
Keep in mind that you can get 530 to 570 streetable HP out of those motors with just a cam, heads (sometimes stock ported), and tuning.
You will need a totally new exhaust, upgraded fuel system, electronics, and other items to make that work right.
Carb is counterproductive on a car with limitless EFI tuning capability...
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1984 Camaro: 350 Auto, Global West Suspension, Baer Brakes, CTW Wheels
1989 GTA: Bolt-on L98. Global West Suspension, full Magnaflow exhaust, Wilwood Brakes, CTW Wheels
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