I think you should be happy with the performance. Your combo sounds really similar to my old one. 407" AMC with good heads, made 499 na before I put a Bullseye S483 with the 96mm 1.32 T6 exhaust. Came up on boost pretty nice and made strong power. Wouldn't be ideal for a corner carving application but it was a fun street piece.
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1983 Jeep Cherokee, low and 2wd, turbocharged modern Hemi 6 speed
1977 Jeep Wagoneer, stock appearing, 407" AMC & 83mm turbo sold
1976 Jeep Wagoneer, stock appearing, 407" AMC & nitrous 11.3 @ 114 rip
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