later mk1 diesels were hydraulic83-84 i think
most ME blocks ive seen were hydromost MF blocks ive seen were mechthe CY that came from my 84 rabbit, mech..The USA didnt get hydro lifters till 86..And why not use an AAZ head, instead of another 1.6 head? the AAZ head flows way better..
I've got a 1.9 AAZ head on a 1.6 MF mechanical block, and I have no starting problems with the block heater pluged in .