alright.. while installing my new crank into my 350. i have a slight problem. the crank freely spins with the rear main cap in place, and also with the center cap in place.. and with the front cap in place... but when i put on either of the remaining 2 caps, the crank will not spin at all. do i have an end float problem? (i measured it to be fine). all my bearings seem to be good as well as my main caps clean. should i tear back down and check under the block bearings for debris? any info would be apprieciated. im 18 attempting to build my first small block with the help of some family and friends.