The Fast throttle bodies have very small iac ports which limit airflow before the iac motor is out if range. This usually leads to cold start issues on larger cammed engines even after hot idle counts are minimized.
For cable driven or dbw I have the best results with Nick Williams. (If stock is not sufficient size, and it often is)
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69 Charger. 438ci Gen2 hemi. Flex fuel. Holley HP efi. 650rwhp @7250 510rwtq @5700. 95 F355. 96 Carrera 4S. 59 Cadillac series 62 convertible.
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