If I were to use these on the factory cam, or say this cam http://www.cranecams.com/?show=brows...tType=camshaft
what legnth of pushrods would I need. Also would it be foolish to change the rocker arms, this seems like a pretty mild cam, Think it would do any good?

 

If you are going to do a cam swap then there's really no need for the 1.8 rocker set. Just choose a cam with the geometry you want and be doen with it.

 

7.4" are the stock length

 

Personally I would leave the stock Rockers and get the cam

 

Power wise you won't need different rockers, buy the cam profile to make the power you want. Aftermarket valve springs make the needle bearings in the stock rocker more likely to fail. Harland Sharp has an upgrade for the stock rocker arms to prevent this.