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From your description you really don't want to raise HP as much as raise torque as your trying to pull something .
What rpm range are you in most of time doing this .
Multiple throttles/carbs while will help top end HP will lower low end torque most times .
What you want is intake with long runners and not to wide ports but if you car is carbed you limited to what you can do .
Unless your willing to up rpm to gain power (like change gearing) there not much you can do to increase torque at same rpm, other than FI or bigger displacement .
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