It would depend on what your objective is. Easiest way is to offset grind the 291 crank. You could go to a 1.888 journal and use an ex Nascar rod..i.e. Carrillo or Lentz. The wide journal is the kicker, as the Cup engines haven't used a .940 width rod in many years. ( I do have a set of used 6.2 Carrillo and new bearings if you go that route.) Lots of used low deck cranks out there. Not so much for the tall deck.

More time and money is involved with using a 330/341/345 crankshaft. Turning the mains and the counterweights to low deck size, etc. It can be done. I have a customer running this combo.