Den
Thanks for any help already
With regard to your engine number and the other characters on the block (your earlier photo above refers), here's a breakdown of the other characters, ie. 11J22. Firstly, it looks to me like the 1 has been double stamped (like the last 3 codes of 40P on the engine number) and so the code should probably read
1J22. This is the date of the engine, where
1=the year built, 197
1, the
J=the month,
Oct (as in A=Jan, B=Feb, C=Mar, etc.) and 22 is the date built, 22nd. So, this motor was built on 22nd October, 1971. Hope that helps you.