1971 Scamp performance

Well here's the question.
1971 Plymouth 360 Police block holley 4 barrel carburetor 670 cfm dual feed. MSD. Weiand intake. 1987 Police Block 40 over.
New Hank the crank. Lunati 508 lift cam
727 Torqflite shift kit.
8 three quarter rear 373 gears
This dam thing won't do a f#&$,$ burn out from a dead stop I have tried everything timing is 34 degrees.
Power brake no problem roast the tires.
Not enough torque not enough horse power. Carb seems to open all the way.
I'm stumped. I have been doing burnouts for over 40 plus years. Should compression test. Change the timing ?
Neutral Drop it ... power brake it.
Any sane input would be appreciated