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Lean burn delete is no big deal. All you need is a standard carb and distributor. Sadly you need a base line on your carb. I'd pull it check float settings, check for dirt, and check and record jet sizes. Reinstall with new external fuel filter.
From what I could find for the 400 high performance in 1977 the 9102s and 9103s. But honestly any TQ for a 400 or 440 engine will do. Is your 400 the high performance engine? I prefer the earlier big block TQ, from 1972-1975, with the ported vacuum tap for the distributor vacuum advance.
9077s is a 1977 high performance 400 TQ it should have 4098 primary jets, 5143 secondary jets, and 2159 rods (.070 x .062 x .040) should work perfect if in good shape. Not sure why you would swap out an 850 cfm carb for a 650 cfm carb. the TQ is one of the sweetest carbs ever made. Bowl...
Complete with mounting screws, wires and delay for the choke, Idle solenoid, and 4 barrel kickdown arm. Nice unmolested 1985 QuadraJet #17085408 to from a Truck 360, Auto Trans, 1985 Electric Choke. $100 + shipping.
Thermo-Quad Strip Kit Partial 72 up Solid Fuel 10-203. Some parts may be slightly used, not by me. Three pairs of rods are missing and the 120-5149 secondary jets. $150 + shipping.