This may help... Here is a simplified spec sheet copy that has the both the 7005921 and 7009254 listed. I note just a few differences, two having to do with the choke and one in the power circuit. Although the 7005921 is correct for your truck with auto trans if I understand, the 7005921 was used also in standard transmission cars. The calibration of the 7009254 for "Powerglide" was a bit different than the standard trans cars. Is it of practical concern? Probably not, unless you are looking for "numbers matching" perfection.
