thats fine, reuse all your good parts in the used block. except for the crank. DO NOT OPEN THE BOTTOM END EVER AGAIN ON A USED GOOD BLOCK.
GET THE USED ENGINE, PUT YOUR CAM, ROCKERS SPRINGS, TIMING CHAIN IN IT. THATS ALL YOU NEED TO DO.
getting it fully rebuilt is just a huge waste of money when a good used running engine costs 3 to 600 bucks. toss your mods in it, and have fun with it. getting it rebuilt will not be any better then the used engine really. ( rebuilt has a better chance of failure too)
top swapped engine are a tad faster then a stock low comp engine too. so theres a mod already if your stuck with a n/a block.
