3.58 stroke x 340 main (rods/pistons?)

crackedback said
You are building a .040 over 360 if using the 3.58 crank as a starting point in a 340 block.

That's what I'm thinking but I'm trying to see the virtues. For one, the 340 is in hand and for $364 and a set of 360 pistons you could pick up 27 cubes. So, air flow requirements aren't any different than a LA 360.