kinda confused, BBC question

This is for my 62 comet project.
I have a 502, it came with a flexplate for an auto. I want to run a muncie 4 speed but if I get a flywheel, wont that throw the balance off since it came with a light flexplate?
recommendations on flywheel and clutch and pressure plate I should get?
thanks in advance, I know a 502 isnt very traditional, but what I am going to do with it is.

 

get a flywheel
http://www.jegs.com/i/GM+Performanc...&cagpspn=pla&gclid=CNbWpsOJj7YCFYx_Qgod1z0Acg

 

the automatics use the weight of the torque converter to balance the engine. it is a simple swap. Use a diaphragm pressure plate for best driving results

 

That is the correct flywheel. I have had customers that bolt a Mark lV flywheel on and the balance is wrong.

 

You will need a ext. balanced flywheel.

 

The difference would be internally all other 4 6 and 8cyl, or externally (400 small block 454-502)

 

I would use the Centerforce Dual Friction clutch. I had a McCleoud street/strip and it was a pain sitting in traffic.

 

Yea, makes for a muscular left leg. I had to go automatic because a Ram setup screwed up my back..