5 liter MOPAR

Here's a crank that would allow 305.2 CI in a .020 over 318. I don't know what complications other than main bearing bore size would be involved with a small Ford block for bearing size, but you can find unrun old nascar team stock Chevy rods on ebay for cheap to offset some of the expense.
Crankshaft 340 Dodge 3.145 stroke - Clearance