STRIP BLOCK AND HEAD COMPLETELY 1ST THING, THEN HOT TANK CLEAN IT ALL UP, THEN CRACK CHECK THE BLOCK AND HEAD, IF ALLS OK THEN MEASURE THE BLOCKS FIRST 2 CYLINDERS AND SEE HOW BAD THERE WORN, THEY WEAR THE MOST AS THEY RUN THE HOTTEST. DONT BE SURPRISED IF YOU NEED TO OVER BORE IT .060 ON FIRST OVERHAUL. ITS COMMON ON THESE ENGINES. IF I MIGHT MAKE A SUGGESTION, INSTALL A 350 V-8 CHEVY. YOU,LL BE GLAD YOU DID IN THE LONG RUN. I HAVE 6 1970-72 CHEVY PICKUPS. BEST TRUCK GM EVER MADE. ALSO LOOKOUT FOR A 71-72 FRONT X-MEMBER ASSY THAT WAY YOU,LL GET 5 LUG PATTERN AND DISC BRAKES ,UPDATE THE REAR AXLE TO 71-72 ALSO FOR 5 LUG BOLT PATTERN.
