Nelson
You can replace the cross head / frame front without removing the wings , but the job is much easier with them out of the way . In my racing days we would replace on win a day , but it would be much longer working single handed of course.
As others have said there is quite a lot of parts that must be removed as they are attached to the various parts , but at least it is somewhat simpler on a 60s +4 then later models, be thankful for small mercies!
As well as the cowl , radiator , etc don't forget that the front brake lines run through each side , so be prepared to have to catch any fluid leaks as you don't want this ravaging the paintwork.
You may need to "ease" the front wings apart to get the frame front through, but this should be possible. Stop if in doubt as you don't want to crease them by pulling too hard. If this doesn't look possible then rather than remove the wings I would take an angle grinder to the top tube cut each side off (you are not going to re-use this frame front!) and then it will easily come out.
Keep asking questions as you go , good luck
Last edited by MOG 615; 19/12/20 09:55 AM. Reason: poor proof reading!