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Other than rigging together the plumbing, the throttle body is the last thing on my list. Like you say, a 4bbl throttle body is not cheap. I've got a bosch idle air valve I can use for my fast idle if need be and have been tinkering with the idea of modding a spare/junk mechanical secondary carb into a throttle body if I can successfully mate a throttle position sensor to it and seal off the air bypasses. Also planned to take either a lean burn distributor or a stock distributor with advance locked out to run the input to the MS for spark control.
board member whiplash on here (haven't seen him 'round these parts in a long time tho) made a TB for his MPFI setup using a holley baseplate and a 4 hole spacer. IIRC he was able to rig both an IAC and a TPS onto it....
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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