Lost power all of a sudden. 273 commando.

So let me explain. One week ago my car ran really really good. I have a souped up 273 commando. I'll give you the specs at the end of this. It still runs very good when I cruise around. No bogs, no nothing. But, when I stomp it it's like I have lost 30% of its power. It will hardly spin the tires. It is like it picks up slower then it did before. Still no bog or anything though. It just won't take of like it should. I have a 3000 stall converter and it won't flash that high now either. I don't know if it is because my engine lost torque. The converter is an b&m not even a year old. Maybe it's giving in? It shifts earlier then usually also. I can also now really feel when the secondary vacuum ports open, was not like that before if i stomped from a stop. When it's reved up it runs better but it still feels like i lost power through out the whole register. There is no miss firing, no bogs, just this lack of get up and go power.

Today I checked timing. What do you recommend for initial? I have about 12.
Checked if the throttle opens up completely. It does.
Adjusted valve lash. Perfect.
Tried different springs for the vacuum secondaries. I had the yellow spring in it before. I have now tried the stiffer black. I believe that made it better.
Checked the plugs, looked great.
Adjusted idle mixture screws for best vacuum. It idles perfect.

All I can think of is that it is way warmer outside now, way warmer and I have never had the brand new Holley in this heat before. Let me know what else info I can give you. I'm out of ideas as for today.

1970 duster
1965 - 273 commando
Cam: Comp Cams Magnum 282S - 282/282 Lift 495/495 (solid) Beehive Springs
Edelbrock D4B intake / Holley 670 Street Avenger
Pertronix Ignitor & Flame Thrower coil
Hooker Headers
2.5" Dual Exhaust / Super 44 Flowmaster
8 3/4 - 3.55 - SureGrip
727 auto / Shift Kit
10" 3000 stall converter
B&M Quicksilver Shifter