Specs Original Camshaft 340 from 1972

crackedback said
The cams listed by the OP are all over the place. Do you want stock, something hotter than stock, smooth idle, raspy idle?

My opinion on the cams listed
Mopar Performance P4452757 Garbage
Mopar Performance P4452761AE Decent if you want a raspier idle
Edelbrock 2177 Garbage
Edelbrock 7177 Raspy idle, will make decent power, better cams available
CompCam CL20-212-2 Good cam, raspier idle

The stock replacement cam listed, P4452782 is OK if that's what you are looking for.

Speed Pro CS1019R is a nice cam 214/224 .443/.465 Not crazy on idle and makes decent power for a smaller camshaft.

Look at the smaller side of the Lunati Voodoo line or Comp XE line.

AGREE almost 100%
stock replacement cam needs higher compression, gears, converter, good gas and revs- dog in low compression motor and it's obsolete- long ramps- low lift
Speed Pro another engine builder chevy regrind, as is the 204-214 can do much better
Agree on Lunati voodoo line but on the Comp XE-HL regular comp xe were designed by UDHarold before the Voodoo line- voodoo is more modern and designed for MOPAR lifter not chevy lifter, Howards are even later but look for the * in the catalog indicating MOPAR