crankshaft recommendations

Eagle cast cranks have a bad reputation but SCAT? yes Chinese cast (think foundry work) but machined by SCAT in the USA.

K-1 is probably better but more expensive.........does K-1 even make a cast crank.

A longer stroke would be cool but if your stock steel 340 crank is good i would go with it.

If long turn plans are 550+ HP then maybe not. but i wouldn't go cast crank by any one if that was my goal. steel all the way!