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You need a 5.8 balancer with the sensor ring for the crank position sensor and a 28oz flywheel or flexplate to match whatever transmission you have. The 302 Y pipe will also have to be widened, but otherwise it's a direct swap with no wiring or computer changes necessary.
If its all there its a good find , whats wrong with the 302 ? don't throw it away its a roller motor , you may want some of the roller cam accessorys...Lew
Bummer , but you can still get a 351 & build it better than a lightning ,the GT-40 intakes are hard to find , or leave it stock , it will pull better than the 302 on the low end ...Lew