Originally Posted by Cloaked
Go-to is a 13x13 LH for the 454 regardless of the gearing ratio. There are other possibilities. Keep it simple and functional. Don't worry about making Jeff Foxworthy proud.
As was stated, if you want to know the current 4 banger, pull the prop and look on the hub.
13x13 traditional hand finished prop (Federal/OJ)? That would be on the small side for 454ci. 14x14 and 13x15 were the classic prop sizes that came on big block Correct Crafts, so I would consider 13x14 a minimum. A modern CNC 13x14 would most likely be the best for all around use, and a CNC 13x13 would be a good pulling prop. Both choices "act" about an inch larger in pitch than their classic hand finished counterparts.