1) I used a 2.2M for R1 in mine without any issues.
2) You can use any dual op-amp you want for the IC. Will using a low noise op-amp make a significant difference in the circuit’s noise floor? Maybe… maybe not. Personally I feel a high quality regulated power supply would do more to keep any noise to a minimum. I power my mini pedal board with a rechargeable 12V lead-acid battery to keep noise level down. I wouldn’t be able to use my Germanium treble booster in the chain if I didn’t.
3) Mouser has low profile sockets that may or may not allow you to socket the op-amp. Take a look at the data sheet to see if you have enough clearance room in your build.
http://www.mouser.com/ProductDetail/Ari ... Gfug%3d%3d