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For another option, check out my build. I installed my Camaro subframe the same way as you and I used a Welder Series Crossmember kit as a starting point. I. If you are planning on an underfloor master cylinder/booster kit, make sure you have that mocked up before you fit your crossmember in. I'm going to be running a small block and a 700r4. It got a little tight under there with the CPP underfloor power booster but it all fit. If you are planning on a firewall mounted master cylinder/booster it opens up a lot of room.