ok i also fount a nother 283 block im my grandads building its is bored like .60 over but evey one is tellin me to bore it to 4.00 is this safe its like .125 over i was like it dont sound safe but a lot of the old guys arounf here say the old 283 blocks like 68 and older was made with really thick walls so you could bore them .125 over and be good is this true