Should I go Big block or Small block?

1973DartSport said

Are there stroker kits out there for 340's that don't require modifications to the block?

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use I beam rods.

the only reason you have to modify the block [keep in mind 340 and 360 have to be clearance'd at the bottom of the bores for h beam rods] is when using H beam rods.

318 with the small bore need a lil more removed.