I have the numbers for 1966, which should be very similar. The manual and automatic trans non-C.A.P. have (as standard) a 120-294S main jet with a 75-1734 two step metering rod measuring .026 and .021 on the manual trans, and 75-1736, .027 and .021 on the automatic. One step leaner uses 120-297S jets, and two steps leaner uses 120-298S jets, using the same metering rods. The C.A.P. versions are 120-310S as standard ( both manual and automatic), with the 75-1641, .028 and .025 rods in the manual applications, and 75-1727 , .029 and .025 in the automatic. Next step leaner is 120-294S, and two steps leaner is 120-297S with the same rods. respectively. If I can find my factory Carter book, I'll verify it the same for the '65 model year. I'm not seeing a 4952 listed for any cars or light trucks. Maybe something heavy duty or industrial? Post a photo maybe?
