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You might have been better off with a edelbrock 650 with vacuum secondaries being watched by a wide band oxygen sensor with gauge.
People really hated GM tbi on pretty much everything.
To make the 400r4 live in a 1ton you are going to want a transmission temp gauge and huge cooler for summer time. I would even recommend using the pure stock transmission cooler in winter and a huge cooler in summer. I dont think they like running cold.
The put in a manual lock up so you can run in 3rd gear with the TC locked up. Other wise they dont lock up unless in over drive.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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