I tend to disagree , more CI is Ok in a race engine , but for an efficent longer life engine I like to maintain the rod ratio & tq so less is more to me , I would defintaly stay at 451 CI for a street engine & keep the oil ring away from the wrist pin
I feel the 440 Source kit may be cheaper in the long run , you will have a lot of machining to get the journals down to size & then have to pay for the balancing on top , , you can get a quote for pricing but it is probably as cheap just top order the new kit with rings, brg & pistons all included with the new crank & rods