im getting edelbrock performer heads and a comp cam, with the heads it says that you need longer than stock pushrods??? how do i know what length to buy?

 

You should ask Edelbrock and ask them what size they recommend. Also a reground cam will need longer pushrods. You can purchase a couple of adjustable push rods and adjust them for the right size and have a set of regular rods made up to the same size.