Horsepower Estimate?

They cut them off at 5K rpm. 340's would spin OK to about 5300 before laying over with a stock camshaft/head. So there is some HP not "reported", same as the 425hp at 5K on a Hemi.

That cam is somewhere in the high 230's @.050, Not 210 like the stock cam. It is not a small upsizing of the cam, that is a big move ~ 30* more duration at .050 than the stock stick. Worth a bunch more than 10hp over the stock cam, more like 50hp alone. It will use the intake better than a stock cam ever could. It will make some steam up top regardless of the crappy 8.5 compression ratio when using headers. I'd bet as long as the valvetrain stays stable, it would easily turn 5600-5700 in a 340 before dogging over. Lift is still OK for the limitations of the stock port. Touch up the port bowl and it would really shine.

And the 240hp number is a net number not the gross number of prior years. Gross was still in the 270+ rated range

Just my 2 cents.