I'd recheck all the basics: adj valves (.013 in .021" ex). Timing chain (rockover). slipped dampener w the piston stop tool. marks at 10BTDC #1 compression & time dist at that initial (which is stock for all 4bbl and 2bbl w auto and or power pack). 2bbl WO them is 5. Plus compression test (leakdown too if you have a gauge setup)

live every 24 hour block of time like it's your last day on earth