This info is from 440 Source
View attachment 1079254
Shown above is a 2205862 housing, Chrysler part #'s 2240318 and 2448758. These housings are CAST IRON, be careful not to confuse this with the identical part listed below with the same casting number made of ALUMINUM. These were used from 62-64.
View attachment 1079255
Shown above is a 2536767 ALUMINUM housing, Chrysler part # 2536725. This was used on 1965 S/S Race Hemis. Chrysler used the same basic tooling for these as they did for the iron 2205862 housing listed above, so on the upper part of the housing you will find that casting number. However, notice the additional tag added on the lower radiator hose outlet, listing the true casting number. Notice the absence of this tag on the above iron housing. Be careful not to confuse the two.
View attachment 1079256
Shown above is housing 1944916 as both the part and casting number. These were used from 59-63 on non-AC vehicles.
http://www.440source.com/wpumphousings.htm