under 1000hp you will be fine with -8 dead-head (no return). You can get hangers to run twin and triple Walbro 460 pumps and good ECUs should be able to stage the pumps. Three Walbro 460s runs my good friend's 1100rwhp 3500lb 8sec turbo car on E85 with no issues.
Anything over -8 is getting to overkill, IMO.
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