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You can get some edelbrock performance heads for the 283 and ad headers, a small overbore, 600 cfm. carb. and you should see an outstanding increase in power. ALSO, a higher lift cam from edelbrock would work. When you let a motor breath and feed it the fuel it finally will come to life. My 6 cylinder is coming to life and all I have on there is a small 2 barrel and an hei. I'm not done yet but the estimated power when i will be done is 270 hp and 320 ft pounds torque. And thats a small 292 6 cylinder. Your 283 can make that same amount with half the mods necessary! Keep the 283, they are becoming of higher value. Plus there are so many 350 chevys out there that they are really boring if you decide to change out motors I would go with a camaro 396. That would rock in your truck!
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