the only additional thing you would need with a cam is the timing chain and the cost of the cam/timing chain is about the same as rockers
Didn't you change your lifters.
You always need to have new lifters with new cams. :o
...and that 1.9 rocker must be real hard on cam shaft and other components wear. The 1.7 would be a better compromise.
Why would you need head work with the 1.7 and not the 1.9 rockers?
As long as your total lift is less than .550" ,,,,,,,,,with the 105 springs and mild cam you wouldn't be over that even with 1.7 ratio. Would you?