My dad does engine machineing/rebuilds. so i lucked out there. ive seen labor costs all the way up to close to 700 bucks for just machine shop work. my dad would charge about 250 for an overbore, hone, and decking the block/head, and anything minor machineing wise to the crank. I would put the pistons/rods/bearings in yourself, cause that will knock a good bit off the price. but definitely have it cleaned REAL good. too bad no more of you live around here... i could try and hook you guys needing a rebuild up.