yep. I don't care if you buy a kit or everything separate, always double check everything. I don't recommend buying anything and trusting the manufacturer that it's good to go, ootb. Spend a little extra time and money if needed, and do it once. ;)
agree w/ nitrojunkee, check everything anyway! I bought my 505" kit from hughs engines. The race balanced kit, it doesn`t even shake the car w/ a motor plate !