What year is this chrysler small block HM318R36502350

Gossy159 said

Howdy
I am alittle confused about water pumps
What year is thsi block
chrysler small block HM318R36502350 ??
Can anyone help
I want to put a
http://www.flowkoolerwaterpumps.com...lymouth,-MOPAR<br>(1957-70)/product_info.html

Please help
I think its 68

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Block casting numbers alone will not give you a definitive year. I have ablock which is 68-72. The water pumps from '68-'70 and '71 on differ according to outlet location and in this case material. If you have a stock water pump on there now, which side is the outlet? And is it iron or aluminum?