The common wisdom on the I6 to V8 swap is that if you want a V8 car, then start with a V8 car. There are considerable differences including radiator, motor mounts, fuel lines, wiring, transmission, drive shaft, rearend, brakes, front suspension and steering components, etc. Either sell the I6 and buy a V8 car or buy a V8 parts car and change components to the I6 car.
If I were going to the trouble to put in a V8, I would go for a 351W.
Is it worth it? Probably not if you're planning to sell the car, it would be worth less than a stock V8 car in the same condition. But if you're looking for the fun factor and DIY pride, it can be worth it.
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