Hi, I'm planning this for sometime in the future. I plan to remove the front cover and replace all the necessary parts, guides, etc. as I can't afford a major engine wreck. What is the possibility I am going to encounter bolts with threads stripped out of the block, etc.? If the bolts all cooperate, I can handle the mechanical work. I do not anticipate removing or disturbing the heads. Car is in good condition and has 147K miles, running Mobil1.