What type of clutch should i ask for? are there heavy duty cltch kits and does anyone know their price??

What are you building...

What are you driving and where

Yes ask for a H/D but make sure its a German brand.

clutch needs replacing is set up more towards the streets than offroad. how much should i expect to pay for a good heavy duty clutch.

yes

What do you mean by heavy duty?
Kennedy etc?

1700lb or more duty.

that is how they are rated