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I wouldn't be putting a v6 in it. Depending on what you use it for, but torque is the key not horse power. It you wanted to put a v8 in it I would go for a 400CI small block with t5 truck cam shaft but i wouldn't be doing that either.If you make some hybrid you may be the only one that ever wants to own it. ( it probably doesn't stop with just an engine and gear box) If you make sure its turned up correctly and have driven it for quite a while and your still not happy look into the 4.2 transplant.