Cam advice for more torque from 340

Separately is OK. Just get the right length bolts in the right holes.

Just make sure you can place a straight edge center-to-center on the crank and cams and have the dots aligned right on that edge. It is easy to get a tooth off. It looks good in the pix.... but looking at a pix is not the same as being there.

Makes sure you lube up all the cam lobes and lifter bottoms liberally with the supplied lube.

Have you read up on the proper break-in procedure? What oil are you using? That is important.