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K5 Blazer

Going from a 350 to a 454 engine may require you to have the carburetor rebuilt to install larger main jets to get the engine to run good and have good power. A 650 carburetor would better suit the 454...

If you are trying to measure and position a frame, use a "tram", which is a specialized frame measuring tool. If, though, you are looking for specific frame dimensions, off of each vehicle, so that you can design a "composite"...