'69 vibration / dyno testing

i just bought a 69 pony. it is a goreous car, not a scratch on the pain, but when it I try to shift into second gear(from nutral), it wont go. but going from 1-2 has no problem, 3-2 and 4-2 has no problem, only N-2 wont go. when i start out in first however there is a wicked vibration, this i did have looked at, and it was due to a broken engin mount, and and a clutch problem. these i had fixed (and also that made it barely posible to go from N-2, using a lot of my strength) but the vibration is still there, not as bad as before but it is still noticable.

also i was wondering if anyone has run dyno testing on a 69 stang with a two barrel, and then coverted it to a four barrel, i was wondering what the results were.

thanks for any help