You need to do one or two specific test and then report back, as there are so many things that could be part of the make up of this issue and you need to let us guide you thru a process of elimination,
My first suggestion is this .
With the car warmed up accelerate hard from a slow roll in first gear and see if the motor will rev to 5200 cleanly, do not up shift .
If it does not rev clean then with the motor out of gear floor it wide open and see if it goes clean to 5200 and you are allowed to hold it at 5200 rpm for 3 seconds .
Do this at the carb with the air cleaner off so you can see and confirm that the carbs secondary’s are seen to open briefly.
If in this second test the motor will buzz clean to 5200 and let you hold it there, then you do not have a valve float condition, but this still brings up the question we need to ask which is are your valve springs still stock?
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs!
And he was not talking about 1/8 or 1/4 mile ETs!
1) 1940s 100% silver 4 cup tea server set.
Two dry rotted 14 x 10 Micky Thompson slicks.
1) un-mailed in gift coupon from a 1972 box of corn flakes.
Two pairs of brown leather flip flops, never seen more then 2 mph.
Education is what your left with once you forget things!
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