These plates you mention are good things to do, but they are not the so-called big block reinforcements. The reinforcements are on all 69 and on cars (regardless of engine size) and wrap around the lower insides of the shock towers.oh sorry i did but i can't fine them right now. i just made a card board pattern , cut out the 1/8 steel plate and welded it in . after welding up the cracked areas. the plate lays in the outside bottom of the shock tower and makes it flush so there is no place for water to lay and rust it out again.