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Re: 3650 to Cobra block
It all depends on how you are planning to get the 700hp you desire. If you want a blower and since you already have a forged crank, you will need forged pistons and rods, upgraded oil pump, and a Cobra blower swap. You will get 500+ fairly quickly going that route. If you plan on turbos, same forged upgrades are needed but you won't need to swap intake manifolds.
I took my Mach1 engine and built it for less money than buying a Cobra long block. With the addition of a 3.4 Whipple, I am making well over 800hp to the tire.
You are going to spend more money on the power adder and fuel system rather than the forged internals and machine work. I would highly suggest working with an engine builder you trust to help you pick the parts and handle the assembly if you aren't comfortable with that aspect.
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