camshaft for mild 340

Wyrmrider says:
btw lope and broad power range are incompatible given what you want to change-

I disagree

go for power- change your mufflers if you want sound
post your compression, gears carb and headers and you will get another round of opinions that are closer to the mark
stock 340 cam in low compression motor leaves a lot on the table without converter and gears

I agree with everything above except, how do you know it is a low compression engine? Not because he has J heads is it?
What do you consider low compression?