A simple and common repair on that carb and its stripped screws is to go up to the next size of screw, there is room to increase the hole and tap for it. should cost you practically nothing, hell I would even send you a tap if you don't own one and you can send it back when you are done.I'm still going to find a way to fix my 2GC to get my car back on the road as it's my only car in CA right now. Might weld/braze up and re-tap the bolt holes, and I'm not going to lie I've considered using sealant on the top gasket just to get the car running. Not really looking to burn the thing down though.
The options as I see it are:
1) Another 2GC core for ~$100, hope it's in better shape, get another rebuild kit from a better vendor, and try again (probably the sensible move).
2) A rebuilt 2GC, presumably with no leaks, for ~$500, but I can't seem to find one actually in stock anywhere.
3) A correct factory 4 barrel manifold, 4GC, 4bbl air cleaner like someone here recently did (can't find the thread at the moment). I really like the idea of the original look, but not sure I want to take the time to track down every little piece, and it makes less sense with the later 283 in there.
4) This is probably what most here would do, get an aftermarket aluminum manifold (~$300), a new 4 barrel carb (~$500) and some aftermarket 4bbl air cleaner. This is probably the next most sensible move, so of course also not the one I picked. The thought of messing with jets and power valves and rods, and potentially having to tinker with it when I commute between here at 60 feet elevation to my other home at 3600 feet, that's not my kind of fun for a car that's supposed to be a driver.
5) The most complicated and expensive route to get my 'totally not a project car daily driver' on the road again is to switch to fuel injection, so of course that's the one I picked. I think it's the best technical solution for a daily driver.
With that decided, the challenge is I want to retain as much of an original/vintage look as practical (period look, not nuts and bolts correct, obviously). I don't have any aftermarket chrome or billet on the car now and I'm not looking to change that. Modern port fuel injection is superior, but it's not the look I'm going for, so that leaves TBI.