indy block question

I have a world product alum block 572 the shortblock was built by muscle motors, I bought a b 1 top end package it was used but from a reputable guy, headers I got from moparts classifides, if you look around the used stuff is available at good prices, I haven't ran mine yet, with 16.1com. and alky. im hoping for 900+. the world product block comes with bushed lifter bores, indy don't, kb block are suppose to be nice but I hear the wait is quite long, if your not in a hurry go kb