Just installed a new HEI unit in my small block..... fired up .... no problem...... timed it at 10 degrees advanced.... the starter labors to beat hell at this advance...... took the boat on the lake...... pings like a bitch......rechecked timing , still at 10 degrees... Retimed at 2 degrees advance . starts better and doesnt ping. whats the deal ? timing marks off? slipped dampner? any advise would be appreciated.