Too cold to start car
YOU NEED A CHOKE
I used to start mine routinely with no choke. 25 is NOT "cold." Below 20? Getting there
BUT YOU NEED A CHOKE
First question, "does it crank?" I don't mean, "does it sort of turn over" I mean does it really spin? Start by getting a meter. Hook the meter to the starter if possible, if not hook to the big terminal on the starter relay. Crank it and read the meter. Should have minimum of 10.5 OR MORE when cranking.
WHERE is the MSD wired up to? Is IT getting good voltage "when cranking?"
YOU REALLY SHOULD HAVE A CHOKE
Look over (by that I mean UNDER) the cap, rotor, plugs and wires, for tracking, dirt/ grease/ moisture, metallic tracking in the cap, etc
Start by BEFORE you EVER touch the starter, remove air filter, take a light if needed, and give the throttle a pump. You should IMMEDIATELY see a strong shot from the accelerator pump nozzles
If that happens, get in, give the throttle about 3 full strokes, give the throttle a tiny "crack" and crank it up. IT SHOULD AT LEAST FIRE (might die) almost immediately. Within 3 seconds, anyhow.
YES!!! YOU NEED A CHOKE