How much HP would you guess my 340 produces?

jcolman said

The shop that tuned it for me doesn't have a dyno. They are a resto shop that has a lot of experience installing Snipers. One day I would like to dyno it.

According to Motortrend, the stock 340 made 320hp. That's why I though the mods would be good for about 70 more horses.

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On any efi that’s tunable it is very hard to tune WOT without a dyno. Your tuner can ride along with you and make adjustments while you stomp on it but the local police may have a problem with that. So there may be some left in it. Think of the engine as a package instead of adding up the gains from individual performance parts. In my opinion (not worth much mind you) a 10:1 aluminum headed SBM with a 262 cam, sub .500 lift, is 350-400 hp all day long and twice on Sunday.