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If the engine seems to buzz... might actually be gearbox oil level, or incorrect fluid. My 70 made a unholy racket, found that the M40 had ATF in it... That was a sad day. But put gear oil in and no worries since.
Know your rear-end ratio? If it's a 4.30:1, which on a '70 140 isn't unheard of, you're pretty much out of legs at 4500rpms.
Yeah, try a little more advanced timing, good on the valve adjustment... In my experience if the weights/springs on the dizzy are worn or problematic you'll notice it more off the line/low rpms. If the lobes on the shaft though are worn, then perhaps you'd get what you describe after the advance is over & done with. Pertronix is a temporary fix or alternative for that problem.
As for your $ to spend: Suspension. Check your control arm bushings & balljoints for sure.
Dig up another brake booster and have it rebuilt, new diaphragm and upgrade to an inline check valve, using the neck adaptor from a '74 140/160 or a 240 series. If it's the original booster, never having had any attention, it's just a matter of time before the diaphragm & check valve go out on you. Same goes for hydraulic flex lines.
If there's anything left over, get a front swaybar.
140 specialist would be awesome. More than likely though, any shop is going to throw a tantrum when they see it roll up. Greenbook is your friend, Haynes is the next for what the Greenbook glosses over as being taken for granted.
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1966 122s, 1970 142s, 1974 142e... Blue is Beautiful
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