Cover+water pump question

Hey guys so as u can see in my buils thread i got the cover and water pump assembled on block. I purchased the bolt kit from mancinis racing. When i went to put the 2 bolts located under the water pump in they barely grabbed and one didnt, they are 2 1/4 length so i decided to step them up to 2 1/2 if im correct i think they will be fine but wanted to get 2nd opinion