It does not matter in or out, also mounted down low & that far from the carb the idle pressure will have a slight drop . mine is mounted next to the carb to get rid of as much hot fuel as possible,,, it gets hot in south Texas!! smile

1968 Charger COLD A/C Hilborn EFI
512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim
2020 T/A 392 Stock 11.79 @ 114.5