YOur 76 has a Quadrajet or Quadrajunk or whatever you want to call it.
The main metering wells are leaking since the solder plugs that colse
the drilled ports have gotten loose. Take the carburetor off and buy a
rebuild kit that has the foam plug that you can install between the
throttle plate and the bowl. This will cure the hard start problem.
You see, the problem is the gas drips out of the main float bowl until
it is all gone and you end up cranking it for an extended period of time
to fill the bowl back up. Do not get arebuilt carb as you know how
yours works and the rebuilds are trash. It is easier to get a kit for
yours and install the foam block between the bowl and throttle plate.

daveo76 wrote:

> My relatively stock, L48 '76 is getting more difficult to cold start.
> I'm probably up to 10 seconds of total cranking time for most
> overnight cold starts. It starts fine after sitting all day at work
> and it also starts great hot. The choke appears to be working fine.
> I've recently replaced the fuel filter, plugs, wires, cap, rotor, --
> all the normal tune-up parts. While replacing the fuel filter I
> cranked it for a sec. to clear the line and check flow. Fuel was
> pumped out immediately, but do I need to check fuel pressure to rule
> out the pump? Can you rent fuel pressure gages from an auto parts
> store? Any thing else I should check?
>