Almost everything recorded in the 60's was recorded in real time! If you can play it all at once I would definately not use a clicktrack as this can really kill the energy and magic you have together, unless you are used to recording with clicktrack. Every good studio or sound engineer should be able to record live music, as this is the most basic thing a studio should be capable of. Of course it kind of depends on the genre and instruments you want to record but if you want to just capture the energy you have when you perform I would just insist on recording without clicktrack. If this doesn't work it would be better to rehearse more until it works instead of fixing things later in the mix, which could be more easy because of the clicktrack..
