Charlie, seeing you run EFI now, you may want to consider building a new intake. Plenty of places on the internet for info/ideas. Suggest YellowBullet. A modified tunnel ram could make a good starting point.
At your 4 cylinders @200 ci you'll want approximately a 300 ci plenum. Thats a box 15"x4"x5" (inner dimension)or a 15"x 5" ID tube. (total plenum = space between throttle plates and ends of runner. You could use other dimensions to come up with a 300 cfm plenum btw.)
Pypemax should give you an idea of how long you want your runners.
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