I don't have any experience with FItech. That being said, using FAST ezefi, which must be similar... I was able to maintain decent idle(900 rpm) with a cam with a 106 lsa, 248/254@.050 duration. Bypass air, and timing are key. You can probably get where you need without changing cams. Do you use the fitech with timing control? Hopefully some of the fitech users will be along to offer specific guidance.
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'65 Tempest 467 3650# 11.30@120.31
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