440 cutting out at high rpms??????

[terrorizer]

I have a 75 440 that cuts out, spits sputters at full throttle. It idles fine and runs good till about 3/4 throttle, but after that it shoots some fire and just wont rev.  Has new good quality points condenser, new gm coil, new edelbrock carb.  Timing is set at 5 degrees BTDC.  no vacume advanced hooked up. Ive tried multiple carbs and problem persists. I'm at a loss.  Any help would be appreciated, thank you

[hemi1]

too weak of valve springs???

[dm440c]

valve float, point gap, check the distributor to see if the mechanical advance is working