340 camshaft recommendations for stock converter

Around 220+ @ fifty is where you start really trading low end torque for higher end hp.
Trick is you want to extend the powerband higher end rpm (hp) with little effect down low.
It's a judgement call everyone's compromise is different, more under 220 is a safer bet, 220 and over really depends on the person. Obviously there more to it than the intake duration.

Take the Xe comp cam line the xe250h is similar to stock which leaves xe256h and xe262h under 220 and xe268h 224 being about 220 and xe275h anf xe286h above being more street strip type cams where higher stall and deeper gears are desired. So xe268h is a mid ground cam in the line up.