It's always nice getting new parts delivered! I'm trying to keep mine as original as poss where I can. I would love the weight savings but originality is key for me. I'm going for the Regina Oro. Just read the campy timeline and the 7sp SR block needs 130 spacing, so I could never get that in the back of a 753 (unless someone out there has?). What tubing are you? Can you have it set to 130? I've been eyeing up some titanium SR pedals but they are just too expensive. I'll be happy with the std weight when it's built. It won't be too bad for a 32 year old steel bike, I'm sure.
I've decided to go for a nice gold oro too! the price (and fit) from a 7sp SR means it's not going to happen. I'm 531c and 126mm and the '84 Bulgier catalogue does indeed show a gold oro as standard anyway. I too am looking at the nos Ti SR pedals (ebay, £302 in the US) and decided that's absolutely silly money! and they aren't massively lighter than std SR pedals anyway. And they are known to snap at the axle
With your f&f's being 753 you've got a good weight saving already, I think the bulgier raleigh catalogue shows an '83 531 SR team bike at 22lbs so you should be a good half to three quarters of a pound lighter than that