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One problem you can count on is getting your exhaust past your frame. You'll need to buy some block hugger headers of some sort or come up with some other great idea that I haven't seen. My friend just put an early model 4.3 in his 81 frame and had to move the engine back 18" to fit the exhaust past the frame. Incidentaly he decided to build a buggy instead and ditched the cab.

Its a tight fit in the compartment. There isn't as much room as a second gen truck.

You won't have any problems with driveline length or placement.

Its not an easy fit but for different reasons than you seem to be expecting.

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