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Exhaust clearance is a big problem with this swap. The stock GM 4.3L manifolds are too wide in back to fit between the block and the Toyota frame. The solution came from Advance Adapters in the form of headers designed for the 4.3L-into-Toy installation. Hi-Tech snaked the headers in after the engine and tranny were in place. The necessary oxygen sensor was added 12 inches in front of the catalytic c