170cc heads on a 408 would choke that thing like trying to breathe through a straw while running a marathon. You increase the cubes to big block size, you have to have big block size ports. You need at a minimum 190cc or larger to let it breathe properly, that means TFS High Port (195cc), AFR 205, Dart Pro 1 (195cc up to 225cc), Roush 200, RHS 200, Ford Racing Z304 (204cc), Edelbrock Victor Jr (210cc).
Forget the 170s.
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