Will this comp cams kit require machine work?

Hello

The motor is a stock 1970 318. I see comp cams has a kit with the cam, lifters, springs, etc as a matched kit. My question is, can this installation be done with the heads still on the car or would machine work be required to install the springs or seals? the kit is:

http://www.summitracing.com/parts/CCA-K20-222-3/

Looking for a low cost upgrade
thanks