I have a new N47 head and a used '83 block and crank. I would like to prepare the block and crank to accept my new N47 head. Are there any changes other than putting dished pistons onto this block that I should know about? Is the crank in the '83 block the same as the'77 that the head is from? I know that the compression would be too high if I bolted the N47 to the flat-top piston block. So now that I have installed dished pistons into this block (hypathetically speaking)what can I do to just slightly raise the compression? Any other tips to help me would be much appreciated. Are there any other problems I may run into?