340 street build help from experienced input

I think either of the cams you mentioned in your initial post would be as big as you should go with TF heads. Those heads have bigger ports & 340 cubes is, well, not huge, & easy to over-cam it & convert it turd status as a daily driver.
I agree with posts that suggest a single pattern cam [ int & exh duration the same ]. It will reduce overlap & help idle/low end tq. Something in the 225-228 @ 050 range, 108-110 LSA would be good.