Easy
TKF was used in
75 truck 350ci 145hp 350trans rpo LF-5 1x2bbl vin A C10 with federal emissions
76 160hp with all else the same
78 165hp manual trans rpo LS-9 1x4bbl Vin L G van with federal emissions
92 truck 350ci 210hp manual trans rpo L-05 TBI Vin K 30 series (1 ton did not have emissions)