head swap reliability (help)
Try some searches for that and you'll see a lot of talk about that cam with AFR heads and some others. The AFR heads are expensive, but there are other good options to fit your budget.
A reasonable head/cam setup won't hurt reliability, but you will have to do some additional maintenance(springs).
How many miles on the motor? A4(automatic) or M6(six speed manual) transmission? If A4, do you have a stall converter, if so, what size is it? Do you have any bolt-ons, if so, which ones?
Once you fill in those blanks, I think you will get more useful, specific information.

