How street able are these 340 stroker motors?

Hey Dan , assuming you still have the block I built it would work perfect for a stroker with those W2s.

The block is a 71 360 and has already been tubed for roller lifters and has had the oil galleys drilled and reamed for better topend lubrication. 71 blocks were actually 340 cores machined for larger mains and 4" bores. ( correct me if I am wrong )...

Those heads have been mildly ported using MP porting templates , 2.08 intakes , bronze guides ,titanium retainers and super trick Norris stainless bushed rockers.

If you go with a 408+ stroker kit and a .550 range cam you should end up with more HP and torque , better idle ,lots of vacuum at idle and great streetability....

I would have built it that way originally but back in the 90s stroker kits were not readily available and quite expensive.

Not sure why you want to go back to a340 since no one can tell unless they look for the #s on the block.