To me there's way too many useful parts to scrap it. I may have what's needed to get working good. I don't have an immediate use for it, but may some day.
I love those carbs. Between my 4 cars I'm running 6 of them, plus a couple of parts carbs. To me they are like girl friends were in my earlier years, never too many to have. 😊
'64 Plymouth, had one myself in my younger days. Spent a lot of money buying & doing things that I shouldn't have. :cautious: Live & learn, as they say.
What I would surmise about the fuel leak: 1) worn secondary throttle shaft bore, 2) Float not sealing, (for who knows why) causing flooding to secondary bores and puddling on the baffles and seeping out the shaft bores. I would say that the carb has multiple issues and needs replacing.
Put a board between the pipe & floorboard at a high point near the lowest point. Then jack the low point up until it stays where you want it to be. It will take a lot of pressure, but the pipe will give & bend.
You've got very good compression, except (maybe) the 167. You should've dribbled some oil in that cylinder & re-checked. If it comes up a lot, it's a ring seal issue. If it only raises slightly, it's a valve seal issue. Which could be related to the inactive years, or a small carbon deposit on a...
I don't recall, is it a stock cam or aftermarket? The erratic vacuum would tell me aftermarket. If stock, the vacuum could suggest slight compression leakage due to non-use for a period. This may self-cure after some road time. And for the "clunky noises", Do you know how many parts are moving...
Disconnect the timing light and put it back in the drawer. Then adjust timing to get your best idle. Final timing can be done when driving at full temp. While cruising at city speed give a quick stab of about half throttle. If it pings, back off the timing a couple deg. No more ping, perfect...
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