Daniel,
I can't be 100% positive about this, but I suspect your Colnago may never feel the same again regardless of which head angle and rake you come up with. I think once bent and then bent back, the critical areas of important tubes have been compromised. Bending it again is not a real good idea in my opinion. Each bend makes the tube more brittle. The only way to do a proper repair is to replace the top tube and down tube. For a bike of that vintage (meaning made with Prugnaut lugs that were brass brazed and pinned, filed thin, and has a huge curout in the lug) is a delicate job. It should be reassembled using silver braze for joining the tubes and lugs. This is a delicate repair that will require experience and a master touch to put her back without damageing it during the repair while making it impossible to spot any evidence of previous damage. After the repair the frame will have integrity again pretty much as good as new; but there is no guarentee that it will feel like the original. It might. It might feel better. It might (but not likely) feel the same as it does now. It's too bad the fork rake was messed with; that should have been left alone since the bent tubes were probably the reason the bike didn't feel right. I think the rake of a Colnago of that period is between 3.8cm and 4.0cm. Good luck with that project. A 1971 Colnago Super would be a bike I would buy if I could find one my size.
BTW, the decals for that period of Colnago will be available quite soon. I'm sure there are a few 'nagos that need that decal set out there.
Brian Baylis
La Mesa, CA
Crashed and bent my 1971 Colnago and it was never the same after that.
Repaired by Eisentraut, but never had decals for it.
>
>
>
> Dan Artley, Parkton, Maryland
> lots of steep hills around me with a rail trail next to the house.