he's probably got a few K's in his range. add in some FD's and 56's for good measure.

pf isn't too loose if the table is allowing you to play that way. given stacks I would say it's a pretty straightforward call, though it depends on how loosely he will be putting in more on later streets. he will most likely be putting you on a med K or a FD, both of which should bet again when the straight hits.