1994 B18C (GSR) w/ I/H/E

I had to remove my distributor to drill out the small rotor screw. Now that I have put everythin back together with new cap and rotor, I am wondering if I have to reset my timing.

Because I removed and installed my distributor, I am thinking that my timing is going to be way off. Unfortunately I have never set the timing before. Should I just leave it how it is, or go buy a timing gun and try and figure it out on my own. I was mainly wondering about what my timing should be set at.